Subtract 49/60 from 21/84
21/84 - 49/60 is -17/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 60 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 84 × 5 = 420,
21/84 = 21 × 5/84 × 5 = 105/420 - Likewise, for the 2nd fraction, since 60 × 7 = 420,
49/60 = 49 × 7/60 × 7 = 343/420 - Subtract the two like fractions:
105/420 - 343/420 = 105 - 343/420 = -238/420 - After reducing the fraction, the answer is -17/30
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