Multiplying a 2-digit number by 79

Follow the following Steps

1. Select a 2-digit number.
2. Multiply it by 8.
3. Add one zero.
4. Subtract that number from the original number.

   Example:1

1. The 2-digit number chosen to multiply by 79 is 21.
2. Multiply by 8: 8 × 21 = 168.
3. Add one zero: 1680.
4. Subtract that from the original number: 1680 - 21 = 1660 - 1 = 1659.
5. So 79 × 21 = 1659.

   Example:2

1. The 2-digit number chosen to multiply by 79 is 52.
2. Multiply by 8: 8 × 52 = 416.
3. Add one zero: 4160.
4. Subtract that from the original number: 4160 - 52 = 4108.
5. So 79 × 52 = 4108.