A Quick Way to multiply with 11

Have you ever had trouble multiplying with big numbers like 11? Well now those days are over!

Let's take this equation - 223x11
Look at the 223 part. Working from left to right, take each number and add it to the number on left. The first number is 3 and as there is no number on the left, just write down 3.
= 3
The next number is 2, add it to the number on the left - 3, and you get 5.
= 53
The next number is 2, add it to the number on the left - 2, and you get 4.
= 453
The next number is 0 (there is no number), add it to the number on the left - 2 and you get 2.
= 2453
Therefore 223x11 = 2453

discovered by Sujeetha