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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21
To convert 21 over 5 to an improper fraction, you need to perform long division. 21 divided by 5 equals 4 with a remainder of 1. Therefore, 21 over 5 as an improper fraction is 4 and 1/5, which can also be written as 21/5.
The improper fraction for 4 over three is 4/3.
It is: 1 and 1/4 = 5/4 as an improper fraction
5 1/4 = 21/4.