Multiplying a 3-digit number by 101
Follow the Following Steps:
- Select a 3-digit number .
- The sum of the first and third digits will be the middle digit: _ _ X _ _.
- The first two digits plus the carry will be the first digits: X X _ _ _.
- The last two digits of the number will be the last digits: _ _ _ X X.
- The number chosen is 318.
- 3 + 8 = 11 (sum of first and third digits):
_ _ 1 _ _ (keep carry, 1) - 31 + 1 = 32 (first two digits plus carry):
3 2 _ _ _. - The last two digits are the same:
_ _ _ 1 8. - So 318 × 101 = 32118.
- If the number chosen is 728:
- 7 + 8 = 15 (sum of first and third digits):
_ _ 5 _ _ (keep carry, 1) - 72 + 1 = 73 (first two digits plus carry):
7 3 _ _ _. - The last two digits are the same:
_ _ _ 2 8. - So 728 × 101 = 73528.