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Anonymous
Both 21 and 9 can be divided by 3.
21/3=7
9/3=3
So 21 over 9 can be simplified to 7 over 3.
Wiki User
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Yes, 18/42 = 9/21
three sevenths
No, 9/35 cannot be reduced.
21/35 = 3/5
no it can be reduced to 1 over 3