Subtract 10/28 from 5/42
5/42 - 10/28 is -5/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 28 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 42 × 2 = 84,
5/42 = 5 × 2/42 × 2 = 10/84 - Likewise, for the 2nd fraction, since 28 × 3 = 84,
10/28 = 10 × 3/28 × 3 = 30/84 - Subtract the two like fractions:
10/84 - 30/84 = 10 - 30/84 = -20/84 - After reducing the fraction, the answer is -5/21
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