How do you multiply numbers to eleven mentally?

Answer 1

Easy with eleven

this is an easy trick for multiplying double-digit number by 11

example: 15 x 11

1.)add the digits of the number that you are multiplying :1+5 = 6

2.) place the sum of the two numbers between 1 and 5 (15)

3.) so the answer to 15 x 11 is 165

how about bigger numbers like 84 x 11

1.) the same add 8 and 4 =12

2.) put 2 between 8 and 4 (824)

3.) carry and add 1 to the digit at the left that is 8 + 1 =9

4.) and the final answer is 924

hope this helpz..................... :):)