# Fastest Method to Multiply any number with 11.

Let’s recall how we used to multiply by 11 in our younger days.

5 4 x 1 1

5 Â 4

5 Â 4 Â x

5 Â  9 Â  4

However, there’s an easier way to do this. Check this

5 Â 4 Â x Â 1 Â 1

5 Â  (5+4) Â  4

5 Â  Â 9 Â  Â 4

[note style=”” bg=”” border=”” bordercolor=”{{bordercolor}}” color=””] Whenever you multiply an x-digit number by 11, you will always get x+1 digit answer. [/note]

What happened there?

• First digit of 54 became the first digit of answer 594
• Last digit of 54 became the last digit of answer 594
• Middle digit is the sum of surrounding digits 5+4

Lets try our hands on more complex problem.

6 7 x 1 1

6 Â (6+7) Â 7

6 Â 13 Â 7?

Remember, the note above, it can be only three digit long. So what happened here? Yes, you got it right, you need to carry “1” of “13” over 6 like this:

6 Â 7 Â x Â 1 1

6 Â  Â 13 Â  Â 7

(6+1) Â  3 Â  7

7 Â  Â  3 Â  Â 7

Â You can apply this trick to more than two digit number. Check out this.

3 2 2 4 x 1 1

3 Â (3+2) Â (2+2) Â (2+4) Â 4

3 Â  5 Â  4 Â  6 Â  4

I hope you got the point. If not, feel free to comment below. Till we show you another trick, keep practicing. Happy calculating :).