Subtract 80/56 from 10/21, Solve 10/21

Subtract 80/56 from 10/21

1^st number: 10/21, 2^nd number: 1 24/56

10/21 - 80/56 is -20/21.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 56 is 168

Next, find the equivalent fraction of both fractional numbers with denominator 168
For the 1st fraction, since 21 × 8 = 168,
10/21 = 10 × 8/21 × 8 = 80/168
Likewise, for the 2nd fraction, since 56 × 3 = 168,
80/56 = 80 × 3/56 × 3 = 240/168
Subtract the two like fractions:
80/168 - 240/168 = 80 - 240/168 = -160/168
After reducing the fraction, the answer is -20/21

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