Best Answer

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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8/4 is an improper fraction, he is incorrect.

3 and 1/4 as an improper fraction is 13/4

9/4 = 21/4

If you mean 5 and 4/5 then as an improper fraction it is 29/5

21/4

21/4

It is 21/4