Finding 15 percent of a number

1. Choose a 2-digit number.
2. Multiply the number by 3.
3. Divide by 2.
4. Move the decimal point one place to the left.

   Example:

1. If the number selected is 43:
2. Multiply by 3: 3 x 43 = 129
3. Divide by 2: 129/2 = 64.5
4. Move the decimal point one place to the left: 6.45
5. So 15% of 43 = 6.45.

   See the pattern?

1. If the number selected is 72:
2. Multiply by 3: 3 x 72 = 216
3. Divide by 2: 216/2 = 108
4. Move the decimal point one place to the left: 10.8
5. So 15% of 72 = 10.8.