How do you evaluate $6.4 \times 9.9$ $6.4\times 9.9$ ?

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How do you evaluate $6.4 \times 9.9$ $6.4\times 9.9$ ?

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Answer 1 · 2017-02-24T19:13:15

$6.4 \times 9.9 = 63.36$ $6.4xx9.9 = 63.36$

Explanation:

$6.4 \times 9.9 = 6.4 \times (10 - 0.1)$ $6.4xx9.9 = 6.4xx(10-0.1)$

$6.4 \times 9.9 = (6.4 \times 10) - (6.4 \times 0.1)$ $color(white)(6.4xx9.9) = (6.4xx10)-(6.4xx0.1)$

$6.4 \times 9.9 = 64 - 0.64$ $color(white)(6.4xx9.9) = 64-0.64$

$6.4 \times 9.9 = 63.36$ $color(white)(6.4xx9.9) = 63.36$

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How do you evaluate $6.4 \times 9.9$ $6.4\times 9.9$ ?

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