Math Trick for Fast Multiplication

#fastmathtricks
#mentalmath
#mathtrick This math trick is pretty easy to do, and can be done in your head faster than a calculator.
This trick only works when multiplying numbers that both end in five. A couple of simple steps and you're done!
In addition, the mathematical reasons why this trick work are simply explained at the end of the video.
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[@benthomas6359]

I’m so happy you started uploading again! My GCSEs started this year and these videos are a massive help

[@mikoajpasnikowski7522]

I love this trick! It's so simple and easy to remember + the fact that it works with numbers with 3-digit numbers as well as 2-digit is really helpful. Keep up the good work and thanks for all the help on your channel!

[@sid6784]

Another way of selecting an answer in multiple choice questions is- Question: multiply 10x+5 and 10y+5 Steps- Add X+Y...(a) if answer is even then our eventual answer to (10x+5)(10y+5) will have 25 at the end...(b) if the answer is odd then our eventual answer will be 75 This way people can eliminate answer choices and select the answer wisely in shortage of time

[@karinisvetcool]

I've never understood multiple choice math or calculus tests.

[@spicychipeater761]

Thank for all you done you helped me through 4rth to 5th grade thank you for everything

[@RoseAngella]

Knowing why it works is a must for me. Thanks for sharing. 💚

[@MistyyyYT]

Wow I got a test coming and this is what I get amazing!

[@sharonjuniorchess]

I liked the explanation at the end but a visual representation may help people to see what the algebra is actually. doing A rectangle of 35 on one side and 65 on the other can be reduced to a rectangle of 30 x 60 with a band of 5 surrounding it. This band consists of two rectangles (5 x 30 and 5 x 60) plus one square in the far corner (5 x 5). So the total sum/area is: (30 x 60) + ((30 + 60) x 5) + (5 x 5) = 1800 + (90 x 5) + 25 = 1800 + 450 + 25 = 2275. It was looking at problems like this that helped the arabs to derive algebra; to describe what they were doing.

[@lukedevlin45]

It sounds like your voice is in constant slow motion

[@hichamelattaoui]

Love it,my 10 years and 8 years will love it and they will be showing off at school 😉 like usual.

[@seemapatilJapan]

very good skills.. thanks

[@lavenderlady9942]

👏👏👏 Big thanks to you

[@lidamg4074]

Thank you

[@shadmanameen2270]

Loved the trick

[@divyoroy9056]

Good job

[@zanelemazibuko4972]

can you make bodmas ,exponents ,roots ,functions and relations because my son enjoys learning your math tricks and they have helped him improve in maths

[@gassics4225]

Failed maths so now im here :(

[@Rayhid1956]

Very good.

[@williambunter3311]

A very handy method. The proof is an example of the benefits of playing around with numbers and discovering new truths about arithmetical patterns! I'm sure that when Pythagoras discov vered the right angle triangle equation it was as a result of just doodling around with two squares, rather than from an effort to prove an established theorem.

[@kay14042]

As always brilliant Thanks

[@psycod2548]

Mate, thank so much

[@augustogonzalez6665]

You teach me a lot thanks

[@fonze5664]

The math nerd in me is totally amazed and enthralled by this dark magic trick 🤓 I'm going to use this every time I have to multiply two numbers that happen to end in 5 in my everyday lif-- oh wait, now I'm sad.

[@sdavies9060]

Nice

[@elizapadua6847]

Your a wizard math

[@lechaiku]

the easier way without multiplying by 100 and avoiding decimals: 45 x 95 ------- 4 x 9 || 5 x 5 36 || 25 + 6 5 ----> add the average of 40 + 90 (65) and put just before the unit's place ---------------- = 42 75 135 x 85 ------- 13 x 8 || 5 x 5 104 || 25 + 10 5 ----> add the average of 130 + 80 (105) and put just before the unit's place ---------------- = 114 75

[@phillipcoppernoll2056]

For the last equation. Just do it like the others. 6x3=18, 6+3=9, Divide by 2= 4.5 .. 18+4.5= 22.5, Then add your 5x5=25 AND the answer is 2275. Right?

[@ahnafrahamanchoudhury]

I love Maths and Math teachers

[@noelsingh7065]

U r a great math teacher!

[@AndrejNikolov-xw2gi]

Thank you for coming back!

[@MrMr-yy5th]

Math trick!!

[@josh5784]

Yes

[@fat4ll]

There are nice tricks

[@katherine101able]

Very lovely

[@videosrus99]

I must point out that you missed explaining how you arrived at "add 25" in the first problem. Clearly it is 5x5 but you need to explain that and not assume everyone saw that. I actually thought you were going to work out the problem by multiplying 35 x 100 then subtracting 35x5 which is all mental arithmetic. Something my mum taught me about 60 years ago. Not seen your method before and I think it works better than mum's. Very interesting. I am really enjoying your videos. Thank you.

[@shaffaiman9875]

60!

[@elizapadua6847]

Keep a good work

[@jamiehopkinson1597]

You still upload alot so great

[@baileyrichardson5145]

LOVE YOU DAD 💙💙

[@tecmath]

Hey bails....love you too son :)

[@baileyrichardson5145]

Keep up the great videos.

[@oRNZYM8]

@@baileyrichardson5145 thanks i try my best

[@Reachermordacai]

Awesome, thanks.

[@fieryphoenix897]

I LOVE THESE

[@aishawaddah5311]

Tou are the best in the world

[@emmaford5618]

Such a massive help!! Thank you for these step by step guides!

[@valor36az]

How awesome!

[@sammysidd7806]

I learned lots things!

[@GodIsEverPowerful]

pgood. because the no. of multiplications is less! (compared to regular no. of four multiplications) nice

[@Nick-yv1wy]

Bro how does anybody dislike this kind of stuff??

[@edwardmiddleton1690]

Hey...can you do Constant of Proportionality, please and thank you?

[@Pablo-dn4to]

Can us do a video of using a square root in ours calculators please!!!

[@TSSUNIX12]

45x95 can you solve using this method

[@green_Mascheen]

3:17 ?

[@ericthemadscientist8357]

Huh neat

[@abdulrazack9270]

** who expected me being 11th grade student in CBSE was looking for this video

[@mackymadness86]

Love this channel. You sound like a stoned maths teacher but great content

[@johnng1078]

that's not an aussie accent, that's your voice after eating a meatpie at the AFL

[@johnryder1713]

Well no matter how long it is since you done one of these videos I'll miss em if it was every day

[@joannehall702]

It would be great if you could add more nursing drug calculation😊

[@adrianchineaamoros3230]

Sr your system does not work with 23 x 33

[@MrGyges]

You brighten my dimness

[@drax6445]

Hi love your classes as it helps me in high school. I am confused with say doing 127 * 86 in my head. So by your trick the first part is 128*8=96 then add (12+8)/2 which I get 106. Then 106*100 + 42 = 10642 but this is wrong. Can please explain. Thank you

[@itsmemailingyou4234]

It only works if the numbers end in 5 (both being half of ten is why it works). 10*10=100 5*10=50 100/50=2

[@platinumknight1]

man im looking for a trick i knew like i could multiply 6.748.123 times 3.968.436 in under a minute and very easy but i forgot what it was

[@HeavyMetalRuinedMyLife1971a]

The spherical trigonometry calculation for globe earth curvature is 8 inches per mile squared....this is demonstrably non existent 😎

[@gamerdio2503]

Then demonstrate it.

[@lizzeelike]

why u do average? is this trick work for 45X96?

[@ahnafrahamanchoudhury]

Opps! is this for 4- 12?

[@selmerrasonable2601]

35×26

[@ahmedaboomer7796]

what does ( Av ) mean

[@blackbird8010]

Damn

[@francescovalente7436]

35x95= 35x100 -(5x35) = 3500-175= 3325

[@saiabhi9918]

another wrong method by applying i am getng ok try to solve this 42*43=1806is actual answer but infact iam gettinh 2006

[@gopinathmukherjee1906]

Only works wuth the nunber having 5 as last digit !!

[@joannehall702]

🥰

[@jacobkris4410]

Sounds like the turtle from FInding Nemo.

[@green_Mascheen]

35 x 65 = 3x6 = 18 Av. (3+6)/2 = 4.5 18 + 4.5 = 22.5 22.5 x 100 = 2250 2250 + 25 = 2275

[@linlove7929]

Loved the trick....you lost me with explanation.....sometimes it’s best not to know why! Love your videos....they help me do my grandsons homework. Thankyou

[@sorankurdi1414]

85X33=?

[@hughmacmillan3156]

No answer at the end. 🤦🏼‍♂️

[@TheHdawson]

I was doing fine until the explanation of why this works- now I'm totally confused with the XY explanation and don't understand. Glad everyone else understands, but, you lost me totally with the XY explanation.

[@MicCheckMemoirs]

Dude I could of used this when I was in the third grade :/, I guess better late than never.

[@ItsThatMilkshake]

Doesnt work with 82x75

[@mariamaniscalco7413]

Inhale My Farts only works y 5 end number

[@daphnemckayla7676]

The trick worked alot but the end of the explanation confused me. I got 99.5% right.

[@ahnafrahamanchoudhury]

first in maths 36/50 secondin maths 50/50

[@jessesambro9535]

❤️

[@ahnafrahamanchoudhury]

class?

[@UneekBruh]

Comment🤣

[@tecmath]

Thank you for it!

[@UneekBruh]

@@tecmath no worries. Great vid👌

[@kimberlyroute5983]

You lost me after 3300. I have know ideal how you got 25 Not clear at all.

[@jsaeong]

Kicking it with Kim KIWK the 25 is just the 5x5 in the ones place

[@christopherwilson6527]

Really? Even though he said where the 25 came from multiple times?