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The complement of a number is what needs to be added to make a specific value. Typically when dealing with complements of a number a base of 10 is used (complement of 9 is 1 since 9 +1 = 10).

In the case of four tenths, the complement would be 6 tenths

4/10 + 6/10 = 10/10 or 1

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13y ago

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