Waste less time on Facebook — follow Brilliant.
×

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

Note by Vishwathiga Jayasankar
3 years, 1 month ago

No vote yet
1 vote

  Easy Math Editor

MarkdownAppears as
*italics* or _italics_ italics
**bold** or __bold__ bold

- bulleted
- list

  • bulleted
  • list

1. numbered
2. list

  1. numbered
  2. list
Note: you must add a full line of space before and after lists for them to show up correctly
paragraph 1

paragraph 2

paragraph 1

paragraph 2

[example link](https://brilliant.org)example link
> This is a quote
This is a quote
    # I indented these lines
    # 4 spaces, and now they show
    # up as a code block.

    print "hello world"
# I indented these lines
# 4 spaces, and now they show
# up as a code block.

print "hello world"
MathAppears 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

Sort by:

Top Newest

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

Shahrukh Ahmed - 3 years, 1 month ago

Log in to reply

Nice

S Rohith - 3 years, 1 month ago

Log in to reply

really superb

Vishwathiga Jayasankar - 3 years, 1 month ago

Log in to reply

wow !! nice

Shohag Hossen - 3 years ago

Log in to reply

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

Aj Karl Valenzuela - 3 years, 1 month ago

Log in to reply

×

Problem Loading...

Note Loading...

Set Loading...