How to multiply a three digit number by a one digit number (for example 312 * 3).
- Place one number above the other so that the ones
place digits are lined up. Draw a line under the bottom number.
312
3
- Multiply the two ones place digits. (2 * 3 = 6). Place the six below the
line in the ones place column.
312
3
6
- Multiply the digit in the tens place column (1) by the digit in the ones
place of the second number (3). The result is 1 * 3 = 3. Place the answer below
the line and to the left of the other number below the line.
312
3
36
- Multiply the digit in the hundreds place column (3) by the digit in the ones
place of the second number (3). The result is 3 * 3 = 9. Place the answer below
the line and to the left of the other number below the line.
312
3
936