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To get to an improper fraction from a mixed fraction, multiply the whole number to the left of the faction by the denominator of the fraction. 7 x 21 = 147. Next, add the numerator of the fraction to the product you just calculated. 4 + 147 = 151. Put the sum you just calculated over the original denominator (151/21).

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Q: What is 7 and 4 over 21 as an improper fraction?
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