Multiplying three digit by one digit numbers How to multiply a three digit number by a one digit number (e.g. 159 * 7). Place one number above the other so that the ones' place digits are lined up. Draw a line under the bottom number. ``` 159   7 ``` Multiply the two ones' place digits (9 * 7 = 63). This number is larger than 9, so place the six above the tens' place column and place the three below the line in the ones' place column. ```  6 159   7   3 ``` Multiply the digit in the tens' place column (5) by the other number (7). The result is 5 * 7 = 35. Add the 6 to the 35 which equals 41. Place the one from the number 41 below the line and to the left of the other number. Place the 4 above the hundreds' place column. ```  46  159    7   13``` Multiply the digit in the hundreds' place column (1) by the digit in the ones' place of the second number (7). The result is 1 * 7 = 7. Add the 4 to the 7 (4 + 7 = 11). Place this below the line and to the left of the other digits. ```  46  159    7 1113``` Return to Top

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