How to Calculate Faster than a Calculator - Mental Math #1

Hi, this is the very first video of my Lightning Fast Mental Math Calculation Series where I will share 5 Super Fast Multiplication Tricks.
Chapters:
00:00 Topics trailer & Intro
01:00 Trick 1
02:39 Trick 2
03:45 Trick 3
05:07 Trick 4
06:23 Trick 5

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Playlists:

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Please watch: "How to Calculate Faster than a Calculator - Mental Math #2"
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[subscribers.no.videos]

I clicked on this by accident, and now I'm a human calculator. Thank you!

[Griec_e]

This is what should be taught in schools. Like this actually makes sense

[kNoopers]

another funny trick is - every 2 digit number times 101 gives this 2digit twice: 45 x 101 = 4545, 92 x 101 = 9292, 21 x 101 = 2121

[richardwilliamson]

I wish we had learned Vedic math in our schools in Texas. I understand now why the greatest mathematicians are Indians. I never imagined that math could be fun.

[Purplesunsetmath]

This is actually really cool! Usually these things on yt shorts are fake and don't work, but this is actually true. Keep up the good work!

[happygamal]

Woow mashaallah
Seeing this video is one of the best coincidences of my life

[nicolebear.w.]

STRAIGHT TO THE POINT!!! I was shocked but thank you so much!!

[Ehanray]

finally the one math teacher that teached properly

[lexisex-ik]

when a random indian dude teaches you more than your teacher

[tyh]

Why wouldn't we learn this in school??

[redwanhasan]

So mind blowing video!!🤯
Thanks a lot.

[robinischaotic]

YOU JUST SAVED MY ASS i have a maths exam in a week and i waste so much time typing everything in a calculator and as someone with special needs, i really need my time.

[Mirai_Hiki]

Also, Trick 3 intrigued me, so I extended it! Its general form is definitely harder, but I think it's pretty cool, and especially useful for multiplying two *3*-digit numbers ending in 5. 45x125=? Start with 2x4x12+4+12=96+16=112. Since the result is even, divide by 2 (56), and add a 25 onto the end. 45x125=5625. 95x145=? Start with 2x9x14+9+14=252+23=275. Since the result is odd, subtract 1 (274), divide by 2 (137), and add a 75 onto the end. 95x145=13775. 345x615=? 2x34x61+34+61=4148+95=4243=odd, 4243-1=4242, 4242/2=2121, 345x615=212175.

[CRnaixx]

I expected this to be much harder, but it was literally a piece of cake 🔥

[Ace_R.]

Man if you keep doing these vids i just might die out of happiness😅

[smartesttechythings]

Watching at 2x speed makes me calculate 2x faster then calculator 💀

[grumpyolddude]

94 is 6 shy of 100....100x 97 is 9700, that is 6 97s too many. 9700 - 600 (97 is 3 shy of 100) is 9100. 100 is 3 moree than 97, so we subtracted 3 too many, 6 times., so 6x 3 is 18...9100+18 is 9118

[UrielCamacho-zi]

Just memorize all of these Trachtenberg Method rules and you'll be able to multiply all numbers fast asf:

Multiplied By:

12:
- Double the number and add the neighbor.

11:
- Add the neighbor.

10:
- Append a zero to the rightmost end of the multiplicand.

9:
- First step: On the right-hand subtract from 10.
Middle steps: subtract from 9 and add the neighbor.
Last step: reduce left-hand digit of multiplicand by 1.

8:
- First step: On the right-hand subtract from 10 and double.
Middle steps: subtract from 9, double, and add the neighbor.
Last step: reduce left-hand digit of multiplicand by 2.

7:
- Double the number and add 5 if the number is odd, and add "half" of neighbor.

6:
- Add 5 to the number if the number is odd; add nothing if it is even. Add "half" of neighbor (dropping fractions, if any).

5:
- Use "half" of neighbor, plus 5 if the number in this turn is odd.

4:
- First step: subtract from 10, and add 5 if the number is odd.
Middle steps: subtract from 9 and add "half" of neighbor, plus 5 if the number is odd.
Last step: take "half" the left-hand of the multiplicand and reduce by 1.

3:
- First step: subtract from 10 and double, and add 5 if the number is odd.
Middle steps: subtract from 9 and double, add 5 if the number is odd, and add "half" of neighbor.
Last step: take "half" the left-hand digit of the multiplicand and reduce by 2.

2:
- Double each digit of the
multiplicand without using the neighbor at all.

Note these terms:

Left Hand: The first number of the multiplicand.

Right Hand: The last number of the multiplicand.

Neighbor: The number on the left of the number you're multiplying.

Halfs: When you're taking the half of an odd number just forget the decimals and take the whole number for example [5 = 2, 7 = 3 ] so just

P.S.
There is always a zero in the left and right hand of the multiplicand just figure out it yourself I can't explain it any further 😂 (sorry for the bad english)

SOURCE: The Trachtenberg Speed System Of Basic Mathematics (it's a book)

[fluffypariii]

Ohhhh thank you for this! I’m very proud of myself now that I can calculate faster than before! 🎉😂❤

[shadikbejoy]

*Note*
Trick 4 doesn't work if 56*59 and other terms this.