Subtract 9/10 from 63/21, Solve 3 0/21

Subtract 9/10 from 63/21

1^st number: 3 0/21, 2^nd number: 9/10

63/21 - 9/10 is 21/10.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 10 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 21 × 10 = 210,
63/21 = 63 × 10/21 × 10 = 630/210
Likewise, for the 2nd fraction, since 10 × 21 = 210,
9/10 = 9 × 21/10 × 21 = 189/210
Subtract the two like fractions:
630/210 - 189/210 = 630 - 189/210 = 441/210
After reducing the fraction, the answer is 21/10
In mixed form: 21/10

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