Multiplying a repeating 3-digit number by 5,
                   then dividing by 37

1. Choose a repeating 3-digit number (one whose numbers are all the same).
2. Add its digits (or multiply one of them by 3).
3. Multiply by 5.

   Example:

1. If the first number is 444:
2. Add its digits (or multiply 4 x 3) = 12.
3. Multiply 12 x 5 = 60.
4. So 444 x 5 / 37 = 60.

   See the pattern?

1. If the first number is 777:
2. Add 7 + 7 + 7 or multiply 7 x 3 = 21.
3. Multiply 21 x 5 = 105.
4. So 777 x 5 / 37 = 105.

Expand this exercise to others of your choosing by multiplying by other numbers. You can produce many new exercises in this manner.