31x21 #shorts #math #maths #mathematics #mathtrick

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Music by Epidemic Sounds

mathwithjanine

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It's not math if it doesn't work for every combination of numbers.

desmodemon

Se realiza de pasos, primera columna multiplica. 1×1=1, 3+2 =5, 3×2 = 6 .
651.

efrainthomas-ij

Forget the lesson, teacher is beautiful ❤️❤️❤

paulrobertson

It's easy with small numbers like these. Try use numbers ending by 4, 5, 6, 7, 8 and 9. And numbers with 3 or more digits...😊

WolfAs

O sorriso dela me fez Assistir dez vezes o mesmo vídeo

robsondewayinvencoesecriacoes

Similar to how 109 x 109 equals 11881. 9x9=81 9+9=18. You can replace the number 9 and do this with any number pretty much if you know how to do. It's just 1 example

tempest

This method works because the two numbers starts by one (1)

Magdi-jk

It's no wonder our kids are failing and having to see therapist .

marvinpresley

A matemática é uma ciência divina. É muita coincidência e explicações diversas. Um confirmando o efeito do outro.

GuiFerreira-juvu

31×21=

Step 1

Multiple. 1
×1 3(1)
×2(1)

1

Step 2

Cross multiple

(3). [1]
× [2]. (1)
(3×1=3) & (1×2=2) add the two totals
3+2=5

You now have

31
×21

5 1

Step 3

Multiple

3×2=6. (3)1
×(2)1

6

Bring down the six.

You get

31
×21

651

samuelhodges