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You want the units to cancel. Think of what you already have as a value /1. So if you have 90 inches, you would write it as:

90 inches/1 * 2.54 cm/1 inch

This makes the inch on the left cancel with the inch on the right, leaving you with cm as the units for your answer.

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Q: In coverting 90 inches to centimeters what unit would you place the numerator of you ratio?
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