Subtract 3/10 from 6/21, Solve 6/21

Subtract 3/10 from 6/21

6/21 - 3/10 is -1/70.

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,
6/21 = 6 × 10/21 × 10 = 60/210
Likewise, for the 2nd fraction, since 10 × 21 = 210,
3/10 = 3 × 21/10 × 21 = 63/210
Subtract the two like fractions:
60/210 - 63/210 = 60 - 63/210 = -3/210
After reducing the fraction, the answer is -1/70

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