Multiplying three digit by one digit numbers
How to multiply a three digit number by a one digit number
(e.g. 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 6.
312
3
36
 Multiply the digit in the hundreds' place column (3) by the second number (3).
The result is 3 * 3 = 9. Place the 9 below the line in the hundreds' place column.
312
3
936
