Answer :

Both 21 and 56 are divisible by 7 so, the fraction can be reduced. 7 goes into 21 three times, and 7 goes into 56 eight times, so the fraction is 3/8, which is equivalent to 21/56, and is your answer!
3/8 because 21 is 7*3 and 56 is 7 *8

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