Subtract 21/28 from 15/24
15/24 - 21/28 is -1/8.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 28 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 24 × 7 = 168,
15/24 = 15 × 7/24 × 7 = 105/168 - Likewise, for the 2nd fraction, since 28 × 6 = 168,
21/28 = 21 × 6/28 × 6 = 126/168 - Subtract the two like fractions:
105/168 - 126/168 = 105 - 126/168 = -21/168 - After reducing the fraction, the answer is -1/8
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