How to calculate cube roots in your head

Here's how you do cube roots in your head! Avoid looking like Education Secretary Nicky Morgan who was stumped when asked to do a cube root: • Video
Note: the starting number needs to be a perfect cube. So it's more of a magic trick: ask someone to cube a number and then you can deduce their original number quickly.
Check out my book "The Best Mental Math Tricks" (rated 4.7/5 stars on 4 reviews)
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Can you multiply 97 by 96 in your head? Or can you figure out the day of the week when you are given a date? This book is a collection of methods that will help you solve math problems in your head and make you look like a genius. "The Best Mental Math Tricks" (rated 4.7/5 stars on 4 reviews)
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H/T Mashable
mashable.com/2014/12/12/educat...
Arthur Benjamin is a Professor at Harvey Mudd College and well-known for feats of mental calculation. He explains the cube root algorithm in this pdf
www.math.hmc.edu/~benjamin/pa...
This trick is really old--here's a newspaper article from 1913 that explains the trick!
cdnc.ucr.edu/cgi-bin/cdnc?a=d&...
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[@MindYourDecisions]

10 million views! Thank you for making this one of the most watched math videos on KZbin!

[@subswithnovideos-zk2ls]

No problem!

[@hoummoussa3538]

It was very interesting. Thank's you too !

[@namala3009]

You’re awesome my dude

[@minhquang5708]

Thank you

[@MikeLee0000]

what's hilarious is i started being teached cube roots today and got this in my recommendations

[@elizabethposekany4944]

Love how the thumbnail misleads you to think you can just take the first and last digit to get the answer

[@prachiagarwal1395]

@Dawson Posekany LoL yes that’s why I clicked the video

[@samkelisiwebuthelezi3195]

I almost skipped the video like just take the first and last digit but no it's not that at all

[@KaziRifatMorshed_is_here]

Me too

[@aritraroychoudhury9b053]

Really

[@woolcreature9653]

Cube root of 8 is 88

[@rayanrashid7413]

I hope this doesn't get nerfed

[@nightmarefox4070]

The heard the developers are going to nerf it, sadly.

[@duncanm716]

Mine doesn't work, have I missed an update?

[@altomacaroon4853]

Rayan Rashid in the patch notes a buff is coming at the end of the month

[@GaelRivera.]

Unfortunately, in version 20.2 (coming January) this trick will be patched, but hopefully there are some bugs in the system that let us still use it

[@rahulrajendrasaw]

Caution: this works only when you are asked to calculate cube roots of perfect cubes. Don't brag anywhere and fail if someone asks you cube root of 2198 and you say 12 (using this method)

[@marcinkusiak9273]

Because I know that actually the cube root of 2197 is 13 so 2198 is 13.0...1

[@upside2484]

My method: literally memorizing the answer to every problem I’m asked. It comes in handy especially in Calculus

[@clownavision]

you scare me

[@Elliyan4]

You have a power beyond anything we mortals could ever imagine

[@ladysssa6914]

Yeah lmao I remembered when I memorized that the cube root of 11 is 1331

[@speedle9190]

@@Sartfla I think he meant the cube root of 1331 is 11. Just a small mistake

[@darkghoul4049]

@TIV67 Playz I hate trolls like you😂😂😂

[@Jsjsjdhdhsj]

“You first have to memorize the cubes of each number from 1 to 10” nevermind

[@kiyahhdenise]

Mooddd😂😂

[@nunnoffyubehznass2150]

thumbnail, can't memorize ten numbers, finishes with NEVER mind. God bless this youth.

[@thedeekabides]

729 is the only weird one, really. The rest just make sense.

[@SinName_NoName]

*forget it* 🤣

[@JarheadMung]

@@thedeekabides how 729 weird?

[@nickgeorgakis7079]

Does it still work after the latest patch?

[@sintelmk4965]

savage bro

[@thepungod]

You'll need to check the patch notes bro

[@nickgeorgakis7079]

@@thepungodThanks, I'll ckeck them.

[@gravitytwiist-_-2827]

Why did I laugh so hard at this 😭😭😭

[@user-ic4gd9dp2e]

Patch 2019.04 only did bug fixes, so maybe patch 2019.05 will change something.

[@drivernjax]

I'll give you two interesting things I learned on my own. If you add every odd number starting with 1, no matter where you stop, you will have a perfect square. Also, if you wonder if a number, no matter how large it is, is divisible by 4, 8 16, 32, etc. take the last 2 numbers and if they are divisible by 4, the entire number is divisible by 4; take the last 3 number and, if they are divisible by 8, the entire number is divisible by 8, etc. I'm sure I'm not the first person to figure these things out but I was surprised when I learned them.

[@reyhananiz5099]

Also if the last digits are 0, it will be divisible too, like 500 is divisible by 4 because last 2 digits are zeroes, 5000 is divisible by 8 because last 3 digits are zeroes.

[@AlwaysOnForever]

You always learn something everyseconds no matter its important or not

[@user-yx4pb1zk2t]

its called divisibility criterion

[@drivernjax]

@@user-yx4pb1zk2t I don't know about divisibility criterion. I just found it by accident one day. The square root thing I discovered when I was taking an online IQ test. It gave the following: "16, 25, 36 . . . What is the next number?" I looked and saw 16 + 9 = 25 and 25 + 11 = 36. My response was 49 which was correct but for the wrong reason. It didn't hit me that those numbers were perfect squares. I then followed the rule I came up with and found that it was correct.

[@keewffbywrhathrrd3603]

that is pretty interesting

[@TheArtofFugue]

I remember doing this technique when taking a test back in highschool, way before I got into string physics and higher dimensions. I believe it was an exam actually, that consisted of 10 cube root equations to be solved via paper and pencil (show your work). I used this technique mentally, only writing down the table because I had to show work somehow. Couple of minutes I’m the first one done and my teacher is in awe. Feels good

[@julianh1705]

sure

[@jaro551]

You have an exam of just doing cube root equations?

[@lucasng4712]

You do not just get into string physics

[@multida]

What did string theory have to do with this lmao

[@areadenial2343]

And then everybody clapped.

[@user-qu3pv9gb9z]

Next video how to calculate KZbin recommend algorithm

[@xxslytherinxx9967]

😂😂

[@abhishekjoshi8327]

😆😆

[@NappaThaClappa]

Impossible

[@Tei_022]

Absolutely impossible!

[@somespecial754]

Best

[@ahellicopter1396]

It’s sad how the secretary of education can’t remember the cube root of 125

[@ThatControlUser]

Kinda infuriating as a student ;-;

[@sr.braydondo]

she probably did know but was sticking to her rule of never answer math questions on tv. if she started answering easy questions, she’d eventually start being asked harder questions, and when she refused to do them, people would assume she didn’t know how even if she did.

[@4rchi._]

5😥

[@ThatControlUser]

@@sr.braydondo huh, I'll use this logic for my next exams!! Wish me luck

[@ZAICROME]

Jesus said "do not try to remove a spec from thy neighbor's eye when there is a log in your eye" And these teachers out here like: ( 🌳 _ 🌳 )

[@narindersingh2776]

I enjoyed your cube roots solving techniques. Great presentation. I never knew it was so easy after seeing your resolve. Thank you sir.

[@rosegoldenfeather5701]

I have never in my entire life liked an educational video before, but this was really helpful so thank you soooooooo much

[@inquiry-TZ]

My teacher thinks I am a genius. What she doesn't know is that I was actually using this trick

[@tot0N]

"She " Woah nice job

[@chiiimken]

I can't explain how i got it though :'D

[@JimmyBoosterCrate]

@@tot0N what

[@cannibalchicken33]

same here xd

[@72karishma]

But its fake

[@mchapman132]

I have a math degree, worked with numbers my entire career. I’ve never seen this before, it’s very interesting. I love math, in school I would make up my own problems and solve them.....for fun. I’m helping my 10 year old grandson with his math homework and will show this to him. It may give him a leg up on his future classes.

[@Krishna-vw9ko]

These are quite common vedic tricks in Indian education specially among students preparing for competative exams as we need to be very fast in our calculations. You can look for other tricks too in youtube.

[@clashseriescoc2151]

I never had math homework until middle school so fine

[@bscutajar]

This does not in any way help solve any math problems. It is just a neat memorisation trick.

[@formerunsecretarygeneralba9536]

I like math and physics but I realized that I'm really bad at teaching math. Whenever I try to teach my little sister or my friends, they always have trouble understanding. But I am not that bad at teaching (explaining) physics' concepts/theories.

[@AlwaysOnForever]

Wow, grandpa with a ton of knowledge of math. Respect sir, hope you doing well in your old ages teaching your grandson

[@pradneshkarwarker5878]

My coaching classes teacher taught me this trick but it just went over my head. Thanks for explaining properly.

[@Gouldstone.]

I used to actually know this trick, although i did it with square roots. I had no clue it could work with cube roots too, except it was slightly more complicated. You had to do a wierd subtraction thing from the first digit and i forgot exactly how to do it but this is way easier and more impressiveThanks!

[@WhiteGandalfs]

Remember: This only works if the number to be rooted is actually a cube of an integer. Thus, the title should better read "How to calculate the cube root of cubes of integers"!

[@fahrenheit2101]

I think the thumbnail is far worse than the title, don't you agree?

[@lololololol1342]

@@fahrenheit2101 Omg so true

[@kozatas]

integer and between 1 to 100

[@swathi_jangam_7252]

Yes. 🙄🙄🙄🙄🙄I am trying other number but I got wrong now I came to know 🙏

[@WOLLEY104]

I figured that out the hard way

[@corinth9140]

"If she knew this trick she would have answered 5^3 very quickly" Step 1- **Memorize the cubes of numbers from 1 to 10**

[@bp56789]

Well he's technically correct

[@ashaydwivedi420]

😂😂😂😂😂😂

[@lorens7958]

"Quickly"

[@EMETRL]

i dont know if you should be in a high authoritative position if you can't figure out the cube root of 125 in a reasonable amount of time.

[@elpatator]

E_M_E_T Eh, dunno about that. You can be good at your job without knowing maths. This kind of knowledge doesn’t defines someone’s intelligence and ability to do their job well. It’s like knowing countries’ capitals; there isn’t really any merit in learning this kind of stuff by heart. Cant judge someone’s intelligence and abilities based on that.

[@creaty2852]

Now all I need is another video letting me know how to tell that the number is a perfect cube in the first place so I know when to apply this.

[@ammaleslie509]

But 125 is easy! 5x5=25 is not hard, and 25x4 is 100 so that helps you remember 25x5 is 125. That's the only one I could have been able to get right because it is so easy.

[@creaty2852]

@@ammaleslie509 all the smaller numbers are easy but that’s not what I was saying. If you don’t know that 39304 for example, is a perfect cube then you can’t apply the trick.

[@composerlmythomorphic2635]

@@creaty2852 That's what I was thinking about... Simply relying on this trick will get urself tricked and propose a seemingly correct answer. I suppose the most secure way is to use Taylor's Expansion

[@diyavatsavai5778]

@@composerlmythomorphic2635 What's Taylor's expansion?

[@chandragirimaharshi7923]

good

[@kanielbenjamite6607]

This is going in my playlist.

[@a.caprone1501]

I'm finally happy that KZbin for ONCE has recommended me something useful👏🏽👏🏽

[@environmentandme6588]

😂😂😂😂😂😂😂😂😅😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😅😅😅😂😅😂😂😅😂😂

[@priyanshgupta488]

Lmao

[@EliteCubingAlliance]

lol

[@royallobster7899]

kzbin.info/www/bejne/hpyucnuopKeHqqM How to time travel

[@user-mootwiskz]

More like your happy you understood this XD😂🤣

[@clapitboi8213]

I impressed my parents for the first time, yessssss.

[@worldwidehandsomebitches2051]

Walking Meme L O L

[@Sopotastic]

Worldwide Handsome sub to me lol

[@vunniee]

@@Sopotastic No lol

[@Sopotastic]

@@vunniee ok lol that was 2 months ago lol

[@vunniee]

@@Sopotastic ok lol

[@derppotato8006]

If I'm being honest this is very useful because they didn't teach us this in pre-cal and it makes so many things so much easier especially if we aren't allowed to use our calculators.

[@sahilsonawane8567]

I knew this trick as it is Vedic Maths. Well explained !!!

[@doctorcapacitor7932]

Other Students:Whats tha need??We have calculators *_Indian students:Give this man a Medal_*

[@havieshm.s8073]

That explains myself as an Indian. Thanks a lot.

[@anusangeet1869]

I wonder they allow students to use calculator in exams 😲😲 Kash india me bhi aisa hota

[@souravkb]

@@anusangeet1869 in higher education you can use calculators for calculations since the problems are big. Lower grades don't need it coz problems are too simple and most probably you won't come across a cube root of 7 digit number there.

[@anusangeet1869]

@@souravkb par hamare liye to woh problem bade hi hote hai bhaiya😁😁

[@auromira8840]

😂

[@deeknight7434]

Teachers that want you to show your work disliked this video.

[@sebastianstan9655]

This was in my math book itself.

[@-cookiezila-461]

Sebastion Stan Well lucky you

[@sebastianstan9655]

@@-cookiezila-461 we got this in our mid-semester (50 Marks) exams in July 2019. for 3 marks, we had to explain all the steps. I'm in 8th Grade.

[@abeastgaming9600]

That is my math teacher

[@nicholaschen9067]

Tell your teacher the trick then smart one

[@HoopaHideout]

This is the type of thing that got me interested in math as a kid! I love it!

[@eshasinghkethavath1590]

Thank you so much! This trick is very much helpful ☺️

[@abdulrehmanjoiya911]

When the youtube algorithm is more worried about your future then yourself

[@Crabby.1]

I don't have a future

[@Seph2079]

I wish I knew this before. That makes finding cubed roots so much easier.

[@bscutajar]

Not really. It only works for perfect cubes.

[@AsrafAli-zt7ip]

This process is amazing.

[@boomjonggol5757]

What is 1+1? I refuse to answer any math questions on TV.

[@saintsergio5592]

😂😂 Exactly

[@BloodHoundPL]

Is math related to science tho?

[@reduanbadhon6346]

@@BloodHoundPL Science without math is like car without engine

[@lordx4641]

@@reduanbadhon6346 lol maths is the father of sciences

[@reduanbadhon6346]

@@lordx4641 do u even understand what I said?

[@matthew-ov9oz]

i liked the fact that you edited a hand in rather than actually writing even though it would be easier in every way.

[@killerfirewolf1]

what's the fun in that

[@PV-po6zt]

Matthew Smith Actually, there is a website to do this. Its pretty lazy.

[@angelineaurelia3736]

Anonymous Someone name?

[@PV-po6zt]

Darwin Watterson There is many, but one that looks like this one is moovly.com I used to use it back in middle school.

[@TheMaidenReturns]

Darwin Watterson numberude- rootstorm

[@nusratali8337]

Thank you . I know its really hard to reveal a trick . But u did it 🙏🙏

[@AlvinSeville1]

Wow! I'm great with numbers and I love math, but I didn't even know this! A+ to you.

[@itsmoli1803]

And this came in my recommendation after 5 years!

[@rohithreddy140]

For u only 5 yrs but for me 5 yrs 1 week😏😏

[@itsmoli1803]

@@rohithreddy140 😂 you're funny

[@siuuuuu8973]

ROHITH REDDY for u only 5 years and 1 week but for me 5 years and 3 weeks

[@rohithreddy140]

@@siuuuuu8973 lol,just u copied my thought

[@SillioVideo]

looking pretty fly Moli, ig - @_oli.wright_ x

[@user-mz7cn9hq8v]

"Ask someone to pick a number 1 to 100" My grandma: 1

[@billyhartono1205]

Богдан Седин must be 11-100

[@anweshakar6050]

Hahaha

[@Natashahoneypot]

Now is your chance to impress her by knowing the cube root whilst juggling oranges

[@tushtikulshreshtha01]

Nice one

[@ShivamSingh-fw9nj]

She doesn't want to bother you

[@aishanoor14]

I wish I knew that 6 years ago when I needed it the most lol.

[@Forever124buddy]

Thank you for telling us this helpful trick

[@takoyaki_box5576]

I think even memorization is too hard for someone who doesnt know the cube root of 125.

[@37rainman]

@FlyingMonkies325 So in your next post detail the steps you would take to find the cube root of 10 to seven places. (-; Btw, if humans and animals couldnt memorize, they couldnt exist.

[@curdyco]

@@37rainmanyou are right People think they have to oppose an opinion even if it's correct. 🤦‍♂️

[@blackscreenmusicplayer3212]

cube of 125 is 5 so easy

[@blackscreenmusicplayer3212]

@FlyingMonkies325 you literally wrote an essay

[@AdityaRaj-mu5yi]

Its 6

[@kdarkwynde]

Only works for perfect cubes, obviously.

[@MarioplushJean]

Chris Horne Ikr Yeah...

[@suffolk6311]

For sure. After the first example I immediately tried to find the cube root of the earth circumference of 24,896 using this method and it didn't work. I'm not impressed.

[@RodelIturalde]

@@suffolk6311 this might get patched in the future though.

[@sebastionheitzmann3233]

Also not for more than 6 digit numbers

[@37rainman]

+douglas: What he meant when he said that is that the ability to find the cube root of a perfect cube is obviously perfectly useless One can just as easily teach oneself to find the cube root of ANY number, to ANY accuracy desired. What is the cube root of 23.692, rounded correctly to 4 digit accuracy? You can learn to arrive at the solution in a few minutes. 7 digits in perhaps 8 minutes. With pen and paper only.

[@bhavinivaghela4865]

THANKS A LOT FOR THIS AWESOME TRICK🔥🔥

[@minabish1783]

This is really fun and great idea! Iam sooooo trying it!

[@mariokart222]

still, 125 is just absolutely elemental

[@NovaCyn]

+DashRogue yea its even a prerequisite for this technique :P

[@Austin-rx3hz]

DashRogue I'm not gonna like this comment, since it has 125 likes.

[@ryan2-518]

DashRogue yea. It's like 2x3: you don't need to solve it in your head; you should already know it.

[@BabaDka]

Who ever say that you have to be smart to run the US Dept. of Education

[@37rainman]

+Baba: Naïve. So what you are saying is that you are "smart" if you know that 5 cubed is 125? Btw, she was not there to be quizzed by little children about basic math. I would have simply said to the brat, tell me the cube root of 300, accurate to 6 places. I can do it, you cannot -- run along now, and take your parents with you.

[@urmom-qv3wh]

KZbin algorithm: 2014: nope 2015: nah 2016: not a chance 2017: maybe 2018: sure 2019: WOULD U LIKE MATH??!!

[@karahmarie6558]

@@apersonusingyoutube4973 says the guy still using the plus sign...?

[@karahmarie6558]

@@apersonusingyoutube4973 oh no. i was enjoying your out of date you are

[@MartyrPandaGaming]

Ladies, you're both equally pretty or ugly. Pick one, I don't care, because OP isn't wrong. A whole god damn flood of math videoes were in my recommended tonight, when I haven't watched one in, at the least, a year. Now I'm stuck in a god damn rabbithole, coming to watch this video, only because I was curious about the trick to this and another video refused to share. I get here, find some guy posted a comment that was pretty relevant and I find two queens fighting. I just want to root cubes (aussie giggity intensifies). Can't we all just stop fighting, go home and root our cubes in peace... Together? At least it isn't Wednesday though. Never do a rottin' on a Wednesday though. Otherwise the snake will get in grandma's pudding and then all that's left is to unthaw the gold and then repackage it in used Mr. Noodle packages that have juuuuust a little bit of uncooked potassium. You know?

[@MartyrPandaGaming]

@@apersonusingyoutube4973 Do you make these kinds of replies every time you see someone post something "unoriginal"?

[@zerotwo7197]

Taena hhahahahahahaah

[@mahendradaffaputrando7922]

Woah!!! nice trick, simple but easy to understand.

[@shivangghosh22]

Who are getting this in their recommendations after 5 years randomly lol

[@collegemathsinhindiasmr5813]

Help... Lol

[@hamster8706]

I wanted this video and youtube can read my mind...

[@Lead-lx8qx]

@@dianatotova6888 love is real . . . . or is it?

[@abhishekverma8243]

Same here

[@harshitarya6503]

6 it is

[@generalsemyon2369]

Ask someone to pick a number 1 to 100 Imagine they pick 636,056 Something aint right

[@axewtv7027]

lmao i didn't notice earlier

[@Dafunny.]

57x57x57= 185193 but 3 is the end of the number and it’s between 5 and 6 but it’s 57

[@n-4-v]

@@Dafunny. When the last digit is 2,8, 3 or 7, you have to consider the 10's complement of the number i.e. 10 minus the number. So it does correctly arrive at 57

[@Dafunny.]

I forgot to change my comment I forgot 7x7x7=343 so the end = 7 and the front = 57 so it is 57

[@samuraikombat1961]

The answer is 86x86x86 is 636 056

[@atreyipaul3667]

Thank you so much. I have a test coming up and this helps so much. It actually works :)

[@Evi19Black]

that is awesome, now i have just to learn by hard and it is nice to recover that channel. it was recommended to me in summer 2020. I forgot the name of this channel but i found it again and it is awesome

[@nilsr.k.7007]

Q: So, when would this be useful? A: When flexing on your homies

[@Shiro-fz6yj]

LOL FACTS

[@jelmar8740]

Hiring manager: what is your edge among othe applicants Me: I can mentally calculate cube roots of any perfect cube number

[@pinklady7184]

Grrrr!!! I need a head manager, somebody to manage my head while I am forgetful.

[@RandomGuy-vq3gd]

Only useful till 1-100 though

[@37rainman]

i dont think ANYONE realizes you said that with cynical laughter!

[@satyamtekriwal7376]

*upto 100

[@Miloeren12]

@@RandomGuy-vq3gd I found that it can be used to find 1-1000 it’s not 100% accurate but then u just have to use logic to get the middle part

[@kashishpatni8166]

Thank you so much sir, it is just amazing to calculate any cube root instantly lots of best wishes to you.....

[@imrozsazid869]

I love your videos, they helped me much in the olympiad

[@Fatima-qx6uw]

I wanted this type of tricks.....11 years ago..... I wish I can find this.

[@anushkagupta3897]

0:05 idk why but that made me laugh so hard 😂😂

[@juliuskang7937]

Anushka Gupta what happened in 0:04? Could u be more specific?

[@anushkagupta3897]

@@juliuskang7937 "Why would you ever wanna do this?"

[@shadow_alpha589]

This is the single most effective math video I have ever watched

[@sahiba2297]

Thank you for this✨

[@dunabogdany]

Whenever I stand at the supermarket checkout, I wish to be able to work out the cube root of all the prices. Thank you for this great help in real life.

[@weizhou3000]

At the begaining when I learned the computer, every time I did something wrong, I hoped I could replay.

[@abnerlowe2432]

Okay now get off my recommended list

[@MultiFunkyjunk]

Abner Lowe lmao fr

[@thegreatchinesedragon4610]

Abner Lowe - 239 likes but only two replys. Come on guys all least say something.

[@vsipereira1883]

Abner Lowe Hello

[@adhampunk2086]

LMFAO same 😂

[@zForce4]

Abner Lowe mean

[@huyana17]

Thank you for this tutorial it'll be useful someday

[@desertdarlene]

Wow! I never thought I'd enjoy watching math videos.

[@margarettidk4532]

This pops up in my recommendations right when I needed it 😂

[@ayailyasfatima383]

Omg that's sooo cool, but like it's easy to forget

[@jadentran9895]

Ayailyasfatima 3 that is why you have to remember

[@Partyhardy28]

Jaden Tran yeah but after you stop practicing you’ll forget

[@gs5841]

Ayailyasfatima 3 nice said..

[@kennyallison967]

The cube root of 42,875 is 35, not 45.

[@vanamadichinna3654]

Lol!!!

[@anjangiriraj2726]

Thank u Presh I needed that

[@miguel-fy7xi]

Omg thank youuuuu, super duper helpful

[@aouvethikagunasekaran8294]

First time seeing that education channel hit 1.82 subscribers Congratulations keep going

[@markgraham2312]

This is a fantastic video. It is useful, practical, doable, learnable and impressive!

[@a_roY0111]

Thank you very much! It helped me a lot!!

[@gomzy7899]

This came to my recommendation after six years and the day after my maths exam

[@wiwi190]

Lol 😂😂

[@GoldenFlamesx]

okay, now i will write this "formula" on the end of my math notebooks

[@haggaisakayola4456]

Finally someone is thinking like me 🤔💭🤣

[@jojotancoco2465]

This really helped me... Thank you so much!

[@sandeshboodram8791]

WOW! none of my teachers got me to understand this but u did tysm!!!

[@diyamandal8328]

Really helpful , thank you so much

[@p3dr0_o7]

KZbin: You hate math right? Me: yeah. KZbin: here.

[@manuelbarbosa5797]

Y tho :/

[@SimplyAnExistence]

Dope nyan Cat Undefined

[@YTshashmeera]

@Dope nyan Cat ask Siri about it

[@sparklingstarsforeverinthe493]

Dope nyan Cat 5out of 0? = -5

[@michaelzeller2542]

@Dope nyan Cat i ask you friendly to remove this comment!

[@JCW-yn7dx]

WHY COULDN’T YOU EXIST WHEN I WAS DOING NS IN HIGH SCHOOL?!?!?!😭😭🤣🤣

[@nyawrgurasapostle5730]

Dont worry,in next life we will use that

[@akhildas4201]

Ey it is in ncert text book of class 10 th or 9 th - estimation method 😂😂

[@realrythmplayz]

@TIV67 Playz I think you’re in the wrong comment section buddy

[@theweirdwolf1877]

@@realrythmplayz He's on the wrong website

[@SharonDraws]

@@theweirdwolf1877 Yeah

[@StarrDust0]

You made a good niche for yourself Presh with your math channel. I'm sure you're raking in the big bucks too.

[@motormouthalmighty]

THAT IS ABSOLUTELY OUTSTANDING THOUGHT PROCESS AND SCIENTIFIC REASONING.ALL THAT I' M CAPABLE OF SAYING IS " JANICE! IS THERE ANY MORE SCRAN?"

[@pawi239]

OMG HOW COME AM I SEEING THIS JUST NOW??? THANK YOU SO MUUUCH

[@heilykohestani433]

how do you work out the cube root of 4364

[@MindYourDecisions]

+Heily Kohestani The number 4364 is not a perfect cube, it's a bit more than 16 cubed which is 4,096. The method in the video only works for numbers that are perfect cubes. So you need someone to cube a number and then you can extract the root.

[@bonbonpony]

+MindYourDecisions So how to calculate the cube root of a number which is not a perfect cube? And what if the number _is_ a perfect cube, but it has more than 6 digits? I know some people (e.g. Shakuntala Devi) who can perform such calculations mentally, and tell the sequence of decimal digits to whatever precision you ask them for, but they don't reveal how they do it :/

[@Y10Q]

+Bon Bon shut up, you are annoying.

[@DrawingTimeLapse]

How can I know the perfect cube it or not? - to apply this method... And what practical application, if I can not know a priori, the perfect cube it or not?

[@robertbutcher222]

Y10Q Be nice, he was asking a question. Not everyone knows this stuff. I'm new to this method.

[@user-uq3um5nq7d]

I have forgotten about this, thanks for reminding

[@puddlethemudwing1548]

I’m in grade 8 and haven’t even learned Cube roots, but this is gonna be very helpful when I go to higher grades

[@puddlethemudwing1548]

@@meg_8518 so?

[@Chironexe]

@@meg_8518 Ok.

[@tcmeme5693]

@@meg_8518 I took a test back in 5th grade to see if I could skip to 7th. I ended up going through the entirety of high school during my middle school years and got to college at 15. After graduating at the top of my class at M.I.T and studying theoretical quantum physics on my spare time, I am sad to say that I can't figure out who asked

[@theweirdwolf1877]

But u learn cubes and cube roots in 8th grade...

[@puddlethemudwing1548]

@@theweirdwolf1877 I guess different countries’ math teaching speed is different. I’m in Canada and I moved there from Hong Kong, and Hong Kong math is taught 2 years faster than Canada math, so I’ve already learned most stuff in grade 8 and I was supposed to learn cube roots in Hong Kong grade 8

[@jlh5995]

Hey Presh Talwalkar, thank you so much for taking the time and effort to produce this excellent, easy to understand, video tutorial on how to quickly calculate the cube root of a number that is capable of such without fractions. Keep up the good work!

[@tommoore7553]

The cube root of a number that is not a perfect cube would be irrational. Infinite decimal places, not a fraction. But I'm just knit picking. I also enjoyed the tutorial.

[@dangergaming8114]

This is vedic math trick

[@monishas9423]

It's very easy and useful .thank you so much ☺️

[@AKTSERVICES]

Thx for tutorial, good pace, you made me a subscriber...

[@neverback7327]

Thank you this is really very helpful 😊😊😊

[@chikenarch]

Well, I’m never going to use this in my life but it was interesting to know about it 🤷🏽‍♂️.

[@NoobChester8964]

as long as you know the result is an integer

[@TYTL_JU]

Thanks for teaching me cube roots.

[@AtharvaVisuals]

Thank you sir for this trick

[@Brodysseus113]

It only works if you know the number has been cubed though

[@musenw8834]

Yes exactly. Although the more practical method is harder to understand and apply without a calculator

[@apc9714]

It can be useful to have un idea of the size of the cube, comparing the last two or three digits with the cubes of the numbers from one to ten.

[@sebastianstan9655]

@@musenw8834 really? Just do Prime Factorisation...

[@musenw8834]

@@sebastianstan9655 I meant for bigger numbers. Preferably those above a billion or so.

[@sebastianstan9655]

@@musenw8834 calculators.

[@vaishalikhamkar4739]

U r GENIUS MAN!! Thnx a lot! Helped me

[@saddamhussain-sb2qd]

thanks for making this

[@NAMEREDACTED-lg4bw]

Ty soooo much this helped me very well!!!

[@SoWe1]

title should be "how to calculate cube roots of numbers you already know are perfect cubes in your head"

[@maximebaidakov]

That's so useful, thank you ! 🙂

[@dcterr1]

Wow, that's a really neat trick! I'm surprised I've never seen it before.

[@dtikvxcdgjbv7975]

Wow, man! Amazing!

[@Broockle]

At the 185,193 example 185 is closer to 216 than to 125. So why is it 5 and not 6? I don't think I understand what "without going over" means.

[@WeavyBoo]

EXACTLY!

[@Psyza]

it only goes over 125. it will count as 216 when it is equal to or over 216

[@Alprimez]

Broockle Well, actually pick the lowest number which the 185 in between with. Going over means above the 'in between'.

[@Broockle]

Psyto x o that's what he meant. I get it, thx. James Reilly uhm.... that's uh.. wat? xD Alprimez So it should be in the proximity of the highest next to? Sounds reasonable.

[@soratsuki469]

Broockle without going over means not to be over the number?