Explain how estimation helps you place the decimal point when multiplying 3.9 &5.3

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19-11-2017
Mathematics

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Explain how estimation helps you place the decimal point when multiplying 3.9 &5.3

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altavistard altavistard · Answer 1 · 2017-11-19T16:51:15+01:00

altavistard altavistard

19-11-2017

3.9 and 5.3, when rounded off and mult. together, produce the product 20.
Thus, the decimal point must follow the first two digits of your answer, whether estimate or "exact."

3.9*5.3 = 20.67 by calculator.

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