Subtract 21/15 from 21/24
1st number: 21/24, 2nd number: 1 6/15
21/24 - 21/15 is -21/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 15 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 24 × 5 = 120,
21/24 = 21 × 5/24 × 5 = 105/120 - Likewise, for the 2nd fraction, since 15 × 8 = 120,
21/15 = 21 × 8/15 × 8 = 168/120 - Subtract the two like fractions:
105/120 - 168/120 = 105 - 168/120 = -63/120 - After reducing the fraction, the answer is -21/40
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