Subtract 21/42 from 10/24, Solve 10/24

Subtract 21/42 from 10/24

10/24 - 21/42 is -1/12.

Find the least common denominator or LCM of the two denominators:
LCM of 24 and 42 is 168

Next, find the equivalent fraction of both fractional numbers with denominator 168
For the 1st fraction, since 24 × 7 = 168,
10/24 = 10 × 7/24 × 7 = 70/168
Likewise, for the 2nd fraction, since 42 × 4 = 168,
21/42 = 21 × 4/42 × 4 = 84/168
Subtract the two like fractions:
70/168 - 84/168 = 70 - 84/168 = -14/168
After reducing the fraction, the answer is -1/12

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