Question

subtract 1/4 from 7/8

Answer 1

the answer is 5/8. 
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Answer 2

7/8 - 1/4

 rewrite 1/4 with the same denominator as 7/8

1/4 = 2/8

now you have 7/8 - 2/8 = 5/8

 answer is 5/8