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To find the reciprocal you find what would make the number equal 1. Mathamatically represented as 4.5 * X = 1. The easiest way to find it is to set the number over its decimal reduce and flip. So for this problem 4.5 -> (45/10) -> (9/2) Therefore the reciprocal is 2/9 or .2 repeating.

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15y ago
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Q: What is the reciprcol of 4.5?
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