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Multiplying Decimals

Multiplying Decimals. Textbook page 120. How do we multiply by decimals?. To multiply by a decimal we: multiply like we do with whole numbers then we place the decimal by counting decimal units.

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Multiplying Decimals

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  1. Multiplying Decimals Textbook page 120

  2. How do we multiply by decimals? To multiply by a decimal we: • multiply like we do with whole numbers • then we place the decimal by counting decimal units

  3. Example 1:Something that is 1 lb on Earth weighs 0.17 lb on the Moon. How much does a 3 lb flag weigh on the Moon? 3 x 0.17 0.17 *multiply x 3 * count places 0.51We put two digits behind the decimal because the question had a total of two places behind the decimal.

  4. Example 2:Find each product • 0.2 x 0.6 0.2 1 unit x 0.61 unit 0.12 2 units (B) 0.05 x 0.9 0.05 2 units x 0.91 unit 0.045 3 units

  5. Example 3:Evaluate 3x for each value of x • x = 4.047 4.047 3 units x 3 12.141 3 units (B) x = 2.95 2.95 2 units x 3 8.852 units

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