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1/7
21 over 49 in lowest terms is 3/7
7/9
2/7
7
The lowest term for 49 over 63 is 7/9
13/7 is the lowest form
5/7
49/91 reduces to 7/13
both are divisible by seven. 42/49 = 6/7
6/7
7/10 is in its lowest terms.