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Two methods can be used here; take your pick.

1) Multiply 2 times the number, multiply 1/2 times the number, add the results. Example: 2 1/2 times 20 = (2 x 20) + (1/2 x 20) = 40 + 10 = 50.

2) Convert the mixed fraction into an improper fraction, than multiply. Example: 2 1/2 x 20 = 5/2 x 20 = 100/2 = 50.

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Q: How do you multiply two and a half times a number?
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