VPS 1 : Multiplying any number by 11

P.S: The number must be a 2-digit number.

Steps:

1. Add the 2-digits of the number together.
2. Place the sum of the two-digits between the 2 digits to get the answer.

Eg:

21x11->2+1=3, Answer=>231

36x11->3+6=9, Answer=>396

29x11->9+2=11(a 2-digit number, hence, 1 gets carried over), Answer=>319