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How to Multiply 11's, a Trick to doing Mental Math

Updated on December 16, 2012

Multiply by 11's in Your Head Quickly

The Basic 11's

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The Basic 11's

I refer to any number under 10 as a basic fact number. The basic facts for 11 are realistically simple. 2 X 11 = 22 . It is simply the digit twice. This is a simple process but the trick comeswhen you get to 10.



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The Trick to Multiplying 11

Learning Tricks in math will amaze your teachers and friends as you become the human calculator. There are so many different tricks in multiplication but I always encourage that everyone learn and memorize those basic 10 by 10 facts.


Now it is time to multiply by 11.


We are going to multiply 11 by 13.


Place the 1 and the 3 at opposite ends of the problem with a space in the middle. In this space there is room for another digit


Now add 1 +3 for the middle digit


Your answer is 143


Try it with a different number

11 x 24

2 __ 4

2 (2+4) 4

264


Now let's try a real tricky one

11x 19

1 _ 9

1 (1+9) 9

now wait a minute 1 +9 is a two digit number. So we are going to take 10 and the zero will be the middle digit while we add the 1 to the hundreds digit.

SO (1+1) 0 9

209

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    • kthix10 profile imageAUTHOR

      kthix10 

      6 years ago from IL

      I love tricks that get kids excited about numbers and how they work. Glad you enjoyed it

    • clairemy profile image

      Claire 

      6 years ago

      Good hub, and it took me back to my school days when we all had to work with numbers and do maths in our heads and on paper. Even at senior school and in A levels we had to. We were taught to love numbers, I still do!

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