Subtract 15/8 from 21/60
1st number: 21/60, 2nd number: 1 7/8
21/60 - 15/8 is -61/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 60 and 8 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 60 × 2 = 120,
21/60 = 21 × 2/60 × 2 = 42/120 - Likewise, for the 2nd fraction, since 8 × 15 = 120,
15/8 = 15 × 15/8 × 15 = 225/120 - Subtract the two like fractions:
42/120 - 225/120 = 42 - 225/120 = -183/120 - After reducing the fraction, the answer is -61/40
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