Hey!
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Answer: B) half the original number
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Examples:
Multiply a number by 0.5 is the same thing as diving it by 2.
10 x 0.5 = 5
20 x 0.5 = 10
30 x 0.5 = 15
40 x 0.5 = 20
50 x 0.5 = 25
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Hope This Helped! Good Luck!