easy multiplication

Multiply any two numbers from 11 to 20 in your head:-

Multiply any two numbers from 11 to 20 in your head Take 15 x 13 for example… Place the larger no. first in your mind and then do something like this.

Take the larger no on the top and the second digit of the smaller no. in the bottom. 15 3 The rest is quite simple. Add 15+3 = 18 . Then multiply it by 10. In this example – 18 x 10 = 180 … Now multiply the second digit of both the no.s (ie; 5 x 3 = 15) Now add 180 + 15. Here is the answer 180 + 15 = 195 . Think over it. This is a simple trick. It will help you a lot.please comment after reading

#NumberTheory

Easy Math Editor

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Math	Appears as
Remember to wrap math in `$` ... `$` or `\[` ... `\]` to ensure proper formatting.
`2 \times 3`	$2 \times 3$
`2^{34}`	$2^{34}$
`a_{i-1}`	$a_{i-1}$
`\frac{2}{3}`	$\frac{2}{3}$
`\sqrt{2}`	$\sqrt{2}$
`\sum_{i=1}^3`	$\sum_{i=1}^3$
`\sin \theta`	$\sin \theta$
`\boxed{123}`	$\boxed{123}$

Comments

12 x 13 = 156. Nice little trick. Every bit of knowledge counts. Thank you

Shahrukh Ahmed - 6 years, 7 months ago

really superb

vishwathiga jayasankar - 6 years, 7 months ago

Nice

S rohith - 6 years, 7 months ago

oh my god you just thought of something that is cool!!!!

AJ Karl Valenzuela - 6 years, 7 months ago

wow !! nice

Shohag Hossen - 6 years, 6 months ago

Math	Appears as
Remember to wrap math in `\(` ... `\)` or `\[` ... `\]` to ensure proper formatting.
`2 \times 3`	$2 \times 3$
`2^{34}`	$2^{34}$
`a_{i-1}`	$a_{i-1}$
`\frac{2}{3}`	$\frac{2}{3}$
`\sqrt{2}`	$\sqrt{2}$
`\sum_{i=1}^3`	$\sum_{i=1}^3$
`\sin \theta`	$\sin \theta$
`\boxed{123}`	$\boxed{123}$