I have got knowledge yesterday from my lecturer when i study algorithm …

It’s about Russian Multiplication ….

To multiply two numbers A and B … you can just write A*B …

For example 11 * 11 = 121 …

You can do it with Russian Multiplication Loop with rule like this :

You can make to column A and B and Total…

• Under A … just write result of floor(A/2) …  do itt until floor(A/2) = 1

• Under B …  just write result of B*2
• Under Total
  • If floor (A/2) is even then Total = Total + B*2
  • If floor (A/2) is odd then do nothing

Here is the example :

The result is sama 11*11 = 121 …