Subtract 6/63 from 70/21, Solve 3 7/21

Subtract 6/63 from 70/21

1^st number: 3 7/21, 2^nd number: 6/63

70/21 - 6/63 is 68/21.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 63 is 63

Next, find the equivalent fraction of both fractional numbers with denominator 63
For the 1st fraction, since 21 × 3 = 63,
70/21 = 70 × 3/21 × 3 = 210/63
Likewise, for the 2nd fraction, since 63 × 1 = 63,
6/63 = 6 × 1/63 × 1 = 6/63
Subtract the two like fractions:
210/63 - 6/63 = 210 - 6/63 = 204/63
After reducing the fraction, the answer is 68/21
In mixed form: 35/21

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