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Decimals are multiplied like whole numbers, but you should place
the decimal point appropriately. The decimal point is placed such
that the number of decimal places in the product equals the total
of the number of decimal places in the numbers being multiplied.
8.31 x 3 = 24.93
Explanation: 831 x 3 = 2493. There are 2 decimal places in 8.31
and 0 decimal places in 3. The product must have 2 + 0 = 2 decimal
places. Thus, 8.31 x 3 = 24.93
Here are two tips for decimal multiplication:
1. When a decimal is multiplied by 10, the decimal point shifts one
place to the right; when a decimal is multiplied by 100, the
decimal point shifts two places to the right; and so on. Example:
8.31 x 10 = 83.1 and 8.31 x 100 = 831
2. Any whole number can be treated as a decimal. Example:
831 = 831.0 = 831.00 = 831.000