Easy Multiplication Trick you will Actually Use

This multiplication trick is so easy - but you probably don't know it...because it doesn't get taught.
That's OK - youtube and tecmath has your back - with this, the easiest multiplication trick you were EVER taught in school!
Here is THE mental multiplication lesson playlist - progressing you through your mental multiplication.
• Tecmath's mental multi...
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[@jawanjelly7798]

After 12 years you still upload. What a legend.

[@mirir.9866]

I feel so lucky i found this legend when I'm still in school. You really did made me LOVE math. Thank you SO much! I feel like I'll owe you forever.

[@ohm1945]

That’s straight from the soul. Full on!

[@elisya7813]

@@ohm1945 i hate you

[@ohm1945]

@Elisya 78 Thanks,… I think. I suppose any sort of acknowledgment is good acknowledgment. Peace Elysa 78

[@namrahyasir5187]

What yr r u in?

[@itsgettingold]

You know what's magic? Your VOICE. So easy and pleasant to listen to. You look really great on the radio, as they would say back in the day.

[@tecmath]

Thanks. I have a great head for radio!

[@itsgettingold]

@Strat Abuser It means he looks good on the radio. The amplifier might be up to high on the Strat.

[@itsgettingold]

@Strat Abuser You are so lucky to have a Strat - wish I did!

[@tecmath]

I always thought it meant it was saying the person was a bit ugly... that is - they have a great head for radio - in that you can't see them!

[@itsgettingold]

@@tecmath That's exactly what it means-in addition to having a great radio voice. And yes, I, too, look fabulous on the radio!

[@mamipautu1225]

Him: Solve this in 3 seconds. My brain: Don't even bother.

[@rfdst456]

Me too

[@Connetic_]

Fax

[@alive_and_kicking]

Good for you.

[@sumsolver8165]

😂😂

[@winnepeterson7740]

Math has always been like a fun puzzle to me (I’m 71) so this is really great. Don’t remember how I stumbled across your channel the other day but I’m sure glad I did.

[@Jibbie49]

When I took Freshman Algebra in 1963, I had had no Algebra or Geometry in Grade School, as in 8th Grade we were still doing Basic Math. Half the HS class took Basic Math and we were only required one yr of Math to graduate, No summer school prep class, no after school tutoring, no bookstores full of math help books especially on how to solve word problems (Kumon Math, Painless Math). My parents hadn't gone to HS so they couldn't help. I made a "D" for the year & was told I couldn't repeat the class, even by just using my Study Hall period the next yr and not changing the grade. No, No, I was now in the Secretary/ Home Ec tract. Thankfully, there is a world of help today to learn math.

[@sjhewlett]

Absolutely superb. Why was I not shown this in school. You’re awesome!

[@cityofoaks]

I'm enjoying these. We're trying to get a 3rd grade student interested in math using your methods.

[@guy-]

Is he interested?

[@napoleonnz]

My method: 21 x 14: multiply 2x14 = 28, therefore 20 x 14= 280. Then add one more 14 = 294. Easy!

[@ShadowCooper77]

I definitely use that for numbers that are close to a multiple of 10, such as with 21 and 14. But for 17 and 14 I'd rather use this method than 20x14 - 3x14.

[@jasonchangdalekrule]

@@InsatiableMonkey Breaking up a single number is the standard way to do it, but is harder to mental math for most people.

[@Sevan59]

the best way

[@aurorapotter9730]

Thanks !

[@currently_in_a_CATRISIS]

Thank you 😊

[@juanwalker2167]

thank you so much for these! I just started college and wanted to do some deep research and tutoring on math, this channel is AMAZING! God bless you and keep up the good work!!

[@chris0429]

tectmath has break the career of our math teachers, btw thank you so much for this video!

[@skirtonbear1]

I didn’t understand what you meant by how far the third problem was from ten until you showed it in process. Now that you explained it, I need three more problems to know if I learned it. Thank you. I’m dyscalculic and struggle with keeping any numbers in my head, so tricks like this do help because it shows me what is going on with the numbers-that, I can do: comprehend. It’s the calculating that fumbles.

[@GetMeThere1]

for one's with a small digit, like 21 x 14, I just do 20X14 then add another 14. If it was 19X14 then it's 20x14 - 14. You method is nice for the "middle sized" digits.

[@tecmath]

That is a good way of doing it. Thanks!

[@BigAlCapwn]

Yeah I did 15x18 as 15x20-30 to get the 270

[@brucemiller1696]

That is the way my brain works too. Seems easier.

[@dari9345]

@@BigAlCapwn That’s a good method. Other way of showing this is transforming the 15 into a 10 + 5, leaving you with: 18(10 + 5) Multiply every member of the parenthesis, 5 is basically 10/2, so you can calculate 10 first by ading a 0 to 18, and getting half of that for 5 180 + 180/2 = 180 + 90 = 270

[@dave2amsterdam]

21x14=2.1x140. So 2x140=280 then as +0.1 = 1/10th add 14 to 280 which is 294.

[@apollo5152]

Your channel is a very powerful tool. Thank you for teaching this to all of us. Math that’s being taught in elementary schools today is so confusing to the students

[@inthebayarea]

Wow, I am just blown away by the videos I have watched so far. I intend to watch all your videos, EXCELLENT, you are the best teacher ever. Thank you so much for sharing your videos!

[@anonymouscritic1160]

To me this seems fairly difficult to do still. I always just simplify the equations looking for the easiest way to do so. For 21 x 14 that means first calculating 20 x 14, which is 280, and then simply adding another 14 to get 294. For the 15 x 18 I just calculate 15 x 20, which is 300, and then deduct 2 x 15, which is 30, to get to 270. Now the last one seems to be the most tricky, but it really isn't. Just start with 10 x 16, which is 160, and then add 48 (3 x 16), which accumulates to 208.

[@willthecat3861]

28 tens plus 1 ten plus 4... so 294

[@nobelnotesvijaykumar1343]

15*18=180+90=270 how is this? You should use common sense and apply..

[@olspanner]

Where were you when I was in school? Silly question I know, I'm now goin' on 82 yo. lol

[@march6319]

He was a twinkle in a young boy's eye

[@olisaanwuna3741]

GOD bless you Sir!

[@jsa326]

I'm only 67

[@postalinVT]

70 here !!

[@pepper5117]

Wow..

[@srik1026]

Thank you for teaching me this it’s making my timestables so much easier 😊

[@glockomacko]

honestly life saver because, the way I was taught in high school was so complex now knowing this I had to look at it more simple.

[@robertwaid3579]

Thank you for the tips and tricks! But for my own issues, I'll still do the long form. Maybe not in my head, but definitely on paper if available, or on a calculator. Please keep this good stuff coming.

[@CRAGONS]

Now they teach math in schools that are "easier", but also don't work with any complex math, this is even easier and works with complex math.

[@rambabupiridi1370]

Your tricks are so easy and fast! These techniques are out of the world.

[@royksk]

These are excellent shortcuts but for many of us oldies remembering these new tricks is difficult. However we had to do mental arithmetic at school so can often just feel, or see in one's mind's eye, the answer develop.

[@adahobbs6479]

Thank you mate. Keep the content coming please this is gold. I love the way you go over things twice for charity. You are a star!

[@Trapstar_adott]

Yo I came BAKC to tell u thank u so much for helping me since 4th to 11th grade I don’t know what I would’ve done without your channel

[@SpaceWithSam]

Fantastic tricks as usual, you’re so shrewd my friend, also, your videos are informative with clarity and fascinating, that I love the video so much, excellent work!

[@tecmath]

Thanks mate.

[@jeffpalin8467]

This simplification and other tecniques should be taught along with the basic methods in every day shooling.

[@mikhail6746]

Your channel is a national treasure.

[@xiaohai5249]

My mom and dad never teach math practices at home. I was struggling with math. But as grow older by self learning there rules and law to follow in math. Amazing... this made it easy learning special the squares and percent and fraction . They are helpful at work

[@Falsetto2002]

This is a new way to learn multiplication. I need to pass this video to my grandchildren so they can improve their mathmatics. My son would most likely subscribe to this channel. Awesome!!! Thanks

[@Ana-mw3iv]

Just want to say I was feeling pretty upset about bieng a slow poke at multiplying when I came across this :)) you just motivated me and I thank you for that

[@sheenamzafar8124]

I knew amazing content coming up.....that’s why I subscribed to your channel. Good work

[@tecmath]

Thanks.

[@sheenamzafar8124]

@@tecmath 👍

[@joshuastrickland5264]

So now simple math is becoming instantaneous. Like a gut reaction to seeing expressions. Love this content.

[@aletaschulz1108]

This was fun. I learned a new multiplication short cut! Thanks🤗💚

[@tecmath]

Thanks. More to come.

[@missygirl7059]

Thanks. More to come.

[@arnavtandon2814]

Thanks. More to come.

[@mydickisunbelievablysmallb8132]

Thanks. More to come.

[@conely2463]

Thanks for sharing all of these cool tricks that can actually be useful. Many people really appreciate this

[@alexanderm7712]

This is a blessing. I’m extremely intimidated by math. I’ve avoided taking higher positions at work because of my lack of math skills

[@austing9060]

Recommend looking into the organic chemistry Tutor, during this stupid pandemic he has pretty much been my school teacher for math and science

[@alexanderm7712]

@@austing9060 thank you!!!

[@austing9060]

@@alexanderm7712 no problem

[@AClRCLEOFLlGHT]

I've had quite a few accounting jobs, one at a Casino. I've never had a job where anyone did any math in their heads. Even the managers use calculators.

[@alexanderm7712]

@@AClRCLEOFLlGHT I know but personally I’d like to have strong math skills

[@basesixty6739]

This is amazing I forgot I subbed to this channel

[@tecmath]

Thanks mate. Hope you liked the trick.

[@basesixty6739]

@@tecmath it was great

[@Onmysheet]

It's annoying videos you're subscribed to don't get recommended to you.

[@basesixty6739]

@@Onmysheet ikr

[@4glassmilk635]

@@Onmysheet just turn on notifications

[@childrenfungames5473]

Really helpful vids. God bless you

[@JasonWeir-p5t]

While tecmath guy was multiplying 324x513 on the white screen with a marker I calculated the answer in my head coming up with the answer before it was written on screen.Thats mental mathematics.A maths genius doesn't write numbers down

[@_kokayn]

Brooo this is so good, tysm!

[@reubenfevrier2349]

I can’t believe how good this is.

[@russtorque2993]

How good?! He needs to slow down and not race thru it

[@MichaelJacksonzGlove]

@@russtorque2993 I'll try watching it at a slow pace with the playback speed in the settings. I think I'll just do it the normal way,this method just confuses me.

[@sandyl6151]

Love your amazing Math tricks. Thanks for sharing so they can pass on for generation to generation.

[@liliyakamala2348]

Ghana you i needed to relearn multiplikation (how to do it in my mind) after a stroke so this was a god send..

[@nybrielle3675]

Great Technique.

[@beth8589]

This person is the best

[@MarkBowenPiano]

Absolutely fantastic videos! Love learning something new or a new way of doing things through them. What would you do for something like 52*26 though? Many thanks.

[@robrobb]

Yes that's my question as well...was trying to do 47x26 and got a completely different answer, then i tried doing your 52x26 and again got a different answer....HELP tecmath!!!

[@aguy463]

Same concept just a little different, First 52 + 6 = 58 58 x 20 = 1160 Difference between 52 and 20 is 32 32 x 6 = 192 1160 + 192 = 1352

[@evanthomas2232]

If only you were my maths teacher at school…maths would’ve been a lot easier and more enjoyable…thanks! 😎

[@lapurdy71]

You were probably taught FOIL and regrouping in school which allows you to DERIVE these tricks. He isn't really teaching fundamentals, but a limited-use trick derived from fundamentals without mentioning how they were derived. I don't mind teaching these exist, but I'd pause to let people know they exist and maybe give a few examples of degrees of usage rather than dwell on something that calculators make trivial.

[@evanthomas2232]

@@lapurdy71 Fair enough....but doesn’t really matter. If the penny drops....aim achieved!

[@NightStars1122]

Yes, but even he is our elementary school math teacher, he still has to follow board of education teaching guidelines, and can't teach math tricks like these during regular math classes.

[@kateburk2168]

I agree...forgot I subscribed also. When I checked, the next most recent was 8 months ago! I hope that more comes sooner than later as this 70+ yr old woman has a challenge with math subjects.😶 And she doesn't have too many years left. Thanks! 😎

[@tecmath]

Thanks Kate. I have released plenty of videos since then.

[@Cycrose]

Great video dude👍👍👍

[@tecmath]

👍👍👍

[@BellaRae805]

Absolutely love this channel 💙

[@dhanishttababra7938]

this helps so much for doing long multiplication in my head. thank youuu!

[@larsprins3200]

At school we had to memorize the multiplication table not just to 10 but up to 20. Since I wasn't very good at memorizing I figured out precisely this trick so I could calculate the answers on the fly.

[@unclefuddelmer9224]

Isn't it all fun⁉️

[@zenbuddah420]

Love your voice and thanks so much for the math help. Your the best man

[@rudramondal9887]

We needed teacher like you in our school.... If, KZbin invented during our school time😭😭 You are awesome sir.. 🙏🙏🙏🙏 Respect from India

[@robbinveenendaal3851]

You make math easy. Love your channel!

[@tecmath]

Thanks

[@missygirl7059]

Thanks

[@russtorque2993]

Easy?! He teaches too fast and doesn't slow down and revise

[@Apollo_13_Official]

For someone trying to improve their maths skills and having a difficulty remembering long strings of digits when doing this the long way this tutorial from the god of thunder Thor is incredibly helpful

[@tangbein]

This video was a trip down memory lane. 🤣 Thanks for video!

[@McDumbie]

with the 21x14 and similar it seems really tricky to remember to count to that 11 thingy I'd rather use the separation method where i multiply the numbers individually as they are, for example 21x14 = 20x10 + 20x4 + 1x10 + 1x4 = 200+80+10+4 you multiply the 20 with the 10, then the 20 with the 4, then proceed to multiply the 1 with 10 and lastly the 1 with 4 basically 21x14 = (20+1)x(10+4)

[@pokretny]

In this particular example doing it like that: 10x14 + 10x14 + 1x14 is actually easier.

[@dari9345]

@@pokretny I would dare to say 2x14x10 + 1x14 is even easier, by separating 20 in 2x10, I can multiply 2*14 and then add the zero. It is basically the same thing you did, but I think easier.

[@alexeyzolotarev741]

you can do it as (20+1)x14 = 280 + 14 = 294

[@McDumbie]

I love all of these options so much more than the vid and seem even easier to understand than the way I had to do it, thank you all and please come with more easy options if there is! These comments are basically the easy math hacks I was looking for when clicking the video!

[@carol76543]

Thank you! These are REALLY helpful tricks!

[@66edoug]

I have a 3 step method. I multiply to the nearest 10th and either subtract or add as needed. As an example, your first math problem, I multiply 10 x 17 . Then 4 X 17. Then add the answers.

[@grieferoncamera4600]

if you multiply large numbers well (definitely not me ;-;) then its faster i guess

[@66edoug]

@@grieferoncamera4600 I'm used to the way I do it. But I need to see the math problem. My memory is terrible.

[@paysour3]

Absolute brilliant way to get answers to math problems.

[@TheRealDrJoey]

You're good. I say that as someone who flunked Algebra 6 times. Luckily, @ 71, as far as I know, I still haven't encountered an algebra problem in real life. I still can't believe they thought it was something we should "practice" and get good at. If I ever have an algebra problem, I'll deal with it on an ad hoc basis. I just watched your reverso trick for getting some percentages calculated in your head, and now this excellent multiplication trick---BTW, I got them all right. Very cool trick. I'm subscribed as of now.

[@wernerviehhauser94]

I do teach a different notation, but thats basically how I learned it in the 1980 and how I am teaching it since 2008. I would rather say "the trick you missed while not paying attention in class" :-)

[@ba0700]

Multiply 10 x 14 mentally, double it then add 14 to it. Fast and easy.

[@austing9060]

For my trick, I always used the tens trick, just take 17 by 10 plus HALF of 17 by 10 minus 17, so 17*10 + 0.5*17*10 -17 = 17*14, it seems complex by the eye but when you actually do it it's quick and simple

[@TributeHurrikane]

I'm getting this the way you explained 10x14= 140 double 280 plus 14= 294 can you elaborate on this Thanks!

[@ba0700]

@@TributeHurrikane It’s easy to multiply by 10 mentally. In the arithmetic problem 21 x14, I choose to multiply 10 x 14 two separate times and sum the two because it’s fast and easy. It’s also easy to add 14 to the result. It goes like this, 10 x 14 =140 x 2 = 280 + 14 = 294. This works well with most problems similar to this one. Multiplying by 15 could be done by multiplying by 10 first then taking half of that answer and adding to the first answer. For example, 15 x 25 = 10 x 25 = 250 + 125 = 375. Best of luck.

[@TributeHurrikane]

@@ba0700 Thanks that make sense math was not one of my favorite subjects.

[@pieface8032]

Maths is easy when you're willing to learn and have a good teacher. Sadly for me I had neither when I started high school.

[@douglasnewman4163]

Such a great instruction!! Why did we not get taught this in school? Love it ! Thank you!!!

[@russtorque2993]

Because some teachers of mathematics may not have been taught that way themselves

[@davidlewis1680]

You sir are a pleasure to listen to thank you

[@erudite60]

Ooooh! How I wish I knew this when I was in school. Thank you Sir, for educating me........again! 😄

[@lauriepowell3959]

Thanks! You make me feel so smart!

[@tecmath]

Don't thank me. Your did it!

[@lauriepowell3959]

@@tecmath 👩🏻‍🎨👍🏻

[@IS-py3dk]

Wow Sir You are helping me right from other country to my home and then to my classes This us useful 😍

[@tecmath]

Thanks

[@davidrowley9513]

I like this channel. I watch because it's fun. It's always good to learn even if like me you are retired.!!

[@fishtailtiger]

Just found your channel, Brilliant! Today, 50yo, and I finally found out I can enjoy maths! Thanks so much, keep up the cool vids.

[@boonga585]

What an amazing channel love these math tricks

[@maryerichardson8302]

Thank you. When did these math tricks come into existence?

[@जागो-श7ह]

Thanks It helped me alot From 3 weeks I am just searching about it Thanks It was the easiest one

[@guy-]

So nice seeing seniors learning math all over again 😊

[@susanobrien4380]

You are a genius. Like Evan below, I would have loved to be taught the method you use. You make me want to go back to school and start again all these years later. :)

[@Shafkathossain]

Thank you so much for this mathematical magic, sir.😊

[@Gthefray]

I get so excited for these videos! always amazed

[@bharatacharya1]

Thanks for the amazing video Loved you every videos ❤️

[@dedesixhela8270]

Cheers mate first time I’ve done a hard times Good way and really efficient From UK

[@tushaye2175]

Simply Genius.. Everyone can manage this, because it's been made so simple to get our heads around, thankyou..☀️🙏☀️

[@tecmath]

Thanks mate. I'm trying to make this series short and clear. Glad of the feedback.

[@tushaye2175]

@@tecmath 👍

[@ThePrivateryan]

Rad, thanks! I struggled in public school and didn't get the individual attention that I needed to learn so my life in general suffered for it. The high I.Q levels of my siblings who's intelligence blossomed early in life seemed to have skipped me until now. Unfortunately I'm a fifty year old man now and the understanding and epiphany level thoughts that come with regularity these days aren't as life changing as they would have been when I was in grade school through college. I woke up during the night because I was visualizing easy ways to multiply bigger numbers when I began searching out my thoughts and I eventually came across your video which really helps my thought process in general when adding and multiplying numbers. For that, again I say thank you and I party that your helpful hints reach the ears and the minds of as many of our youth as humanity possible. Have a great day.

[@drpkmath12345]

Great and very simple way to explain multiplication concept! Nice job for sure!

[@Tsugomi]

Now I remember why I subscribed, this is actually really good damn

[@romerocottler8671]

Best maths teacher ever 🥳🥳👍🏼

[@RoadTripA1A]

I can't stop picturing the shark from Finding Nemo. I think you should finish all your videos saying, "Fish are friends, not food." 🤣

[@tecmath]

All right. The next video in doing just that!

[@juliuscaesar8801]

Gzzz...had I been taught to solve math this easy, I might have become an engineer!

[@barakasha2812]

Exactly what I said to myself!

[@lori_bain]

I'm 56 and have learned so many math tricks watching your videos. Brilliant! I only got 2 out of 3. 😟

[@bryanfox2920]

trying to retake my asvab and I am glad I came across this.

[@phantomix2244]

Great tricks keep it up! This will help me in high school

[@pjwakelee8227]

Ingenious, where were you when I went to school

[@Xerrea]

00:00, holy moly. You got a new mic since 2013. I werent prepared for that sexy voice

[@Phoenix-dq2uo]

These tricks help me to understand math a little better.

[@vincecooke7211]

This is awesome, I deal with big numbers at work all the time!

[@billmuir4897]

Blooming marvellous; thanks for sharing 😍

[@123KTXBY]

Absolutely brilliant 🤩

[@8DJYash]

Helped me a lot.. Thank you ❤️😊

[@badass98kx250]

You are so helpful I can't appreciate it enough

[@Free_Spirit7]

These are great refreshers (and also remind me how much I’ve forgotten 😝).

[@abakoraabakora1346]

Your videos are great and well presented. P.S your vocals adds a Barry White flavor to it. Very enjoyable.