Multiply Thousandths by Tenths: Learn
How to multiply a three digit decimal by a one digit decimal number (for example 0.529 * 0.7):
Place one decimal above the other so that they are lined up on the right side.
Draw a line under the bottom number and multiply like any whole numbers.
We will concern ourselves with the decimals at the very end.
0 . 5 2 9 * 0 . 7
Multiply the two numbers on the right side. (9 * 7 = 63).
This number is larger than 10 so place a six above the
center column and place three below the line in the right column.
6 0 . 5 2 9 * 0 . 7 3
Multiply the digit in the top center column (2) by the digit in the
center of the right column (7). The answer (2*7=14) is added to the
6 above the center column to give an answer of 20. The units place
value (0) of 20 is placed below the line and the tens place value (2)
of the 20 is placed above the five.
2 6 0 . 5 2 9 * 0 . 7 0 3
The five of the top number is multiplied by the seven of the
multiplier (5*7=35). The two that was previously carried is
added and 37 is placed below the line.
2 6 0 . 5 2 9 * 0 . 7 3 7 0 3
- At the start we disregarded the decimal places. We must now count up the decimal places and move the decimal place to its proper location. We have three decimal places in 0.529 and one in the decimal 0.7 so we move the decimal four places to the left to give the final answer of 0.3703.
Multiply Decimals: Practice
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Math Lessons by Grade
- Estimation and Mental Math
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- Place Value