Multiplying a 2-digit number by 792

1. Select a 2-digit number.
2. Multiply it by 8.
3. Add two zeros.
4. Subtract the original number from the result.

   Example:

1. The 2-digit number chosen to multiply by 792 is 22.
2. Multiply by 8: 8 x 22 = 176
   (Think: 8 x 20 + 8 x 22 = 176)
3. Add two zeros: 17600
4. Subtract 17600 - 176 = 17424
   (Think: 17600 - 100 - 70 - 6 = 17500 - 70 - 6
   = 17430 - 6 = 17424)
5. So 22 x 792 = 17,424.

   See the pattern?

1. The 2-digit number chosen to multiply by 792 is 91.
2. Multiply by 8: 8 x 91 = 728
   (Think: 8 x 90 + 8 x 1 = 720 + 8 = 728)
3. Add two zeros: 72800
4. Subtract 72800 - 728 = 72072
   (Think: 72800 - 700 - 20 - 8 = 72100 - 20 - 8
   = 72080 - 8 = 72072)
5. So 91 x 792 = 72,072.

Practice the left-to-right subtraction. Think each step to yourself as a cue for the next.