Multiplying any number with 11

Ya, ya i know this one is easy but still for those who doesn't know the trick, here it is

Lets take 54 X 11
now simply add 5 and 4 and place the result inbetween the two numbers

so the result would be 594.

Logic behind this would be 54 X (10 + 1) which is 540 + 54. So if you see the tens digit it will be the numbers from the problem.

See its simple.

Now try 32 X 11
it will be 352

Lets step to next level and try 83 X 11
so now add 8 and 3 result is 11 take 1 carry from the tens place and add that to tens digit of the multiplicand
 and place the units digit 1 in between the number.

so the result would be 913.

what if we have 3 digits...... no worry at all
lets take an example 342 X 11
the answer begins with 3 and ends with 2. Now add 3 and 4 and put it after the beginning of the answer. and similarly add 4 and 2 and place it before the last digit of the answer

so the answer would be 3762.

Time to practice more....... Then you will get good hold of this trick.

Enjoy Math 'ing' :)