Multiplying a 2-digit number by 66

1. Select a 2-digit number.
2. Multiply it by 6.
3. Add the digits from right to left
   (see examples, below).

   Example:

1. The 2-digit number chosen to multiply by 66 is 54.
2. Multiply by 6: 6 x 54 = 300 + 24 = 324
3. The last digit is 4: _ _ _ 4
4. Add right to left. 4 + 2 = 6: _ _ 6 _
   2 + 3 = 5: _ 5 _ _
   First digit is 3: 3 _ _ _
5. So 66 x 54 = 3564.

   See the pattern?

1. If the number to be multiplied by 66 is 92:
2. Multiply by 6: 6 x 92 = 540 + 12 = 552
3. The last digit is 2: _ _ _ 2
4. Add right to left. 2 + 5 = 7: _ _ 7 _
   5 + 5 = 10 (carry 1) : _ 0 _ _
   First digit + carry: 5 + 1 = 6: 6 _ _ _
5. So 66 x 92 = 6072.

Challenge a friend and BEAT THE CALCULATOR!