Multiplying 3-Digit Numbers
Multiply 3-Digit by 1-Digit Numbers: Learn
How to multiply a three-digit number by a one-digit number (for example 159 * 7).
Place one number above the other so that the ones' place digits are lined
up. Draw a line under the bottom number.
1 5 9 * 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 5 9 * 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.
4 6 5 9 * 7 1 3
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
4 6 5 9 * 7 1 1 1 3
What is the product of the two numbers?
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Math Lessons by Grade
- Estimation and Mental Math
- Naming Numbers
- Percents and Ratios
- Place Value