Subtract 15/12 from 21/30
1st number: 21/30, 2nd number: 1 3/12
21/30 - 15/12 is -11/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 12 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 30 × 2 = 60,
21/30 = 21 × 2/30 × 2 = 42/60 - Likewise, for the 2nd fraction, since 12 × 5 = 60,
15/12 = 15 × 5/12 × 5 = 75/60 - Subtract the two like fractions:
42/60 - 75/60 = 42 - 75/60 = -33/60 - After reducing the fraction, the answer is -11/20
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