Multiplying a 2-digit number by 5 5/9

1. Multiply the number by 5.
2. Add a zero.
3. Divide by 9.

   Example:

1. If the 2-digit number chosen to multiply by 5 5/9 is 36:
2. Multiply by 5: 5 x 36 = 150 + 30 = 180
3. Add a zero: 1800
4. Divide by 9: 1800/9 = 200
5. So 5 5/7 x 36 = 200.

   See the pattern?

1. If the 2-digit number chosen to multiply by 5 5/9 is 71:
2. Multiply by 5: 5 x 71 = 355
3. Add a zero: 3550
4. Divide by 9: 3550/9 = 394 4/9
5. So 5 5/9 x 71 = 394 4/9.

Numbers divisible by 9 will produce whole-number answers. With other numbers, those using calculators will get repeating decimals.