WEBVTT

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Here is the problem: 4 over 10 times 5 over 10.

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Exact arithmetic with fractions (results kept in lowest terms).

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Multiply numerators and multiply denominators.

4
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Simplify. Divide numerator and denominator by their GCF, 2.

5
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Final answer in lowest terms.

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So the answer is 1 over 5.

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Fractions are combined over a common denominator for addition and subtraction, multiplied straight across, and divided by multiplying by the reciprocal. The result is reduced by the greatest common factor.

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Decimal check: 1 over 5 approximately 0.2.