Subtract 21/60 from 18/84
18/84 - 21/60 is -19/140.
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,
18/84 = 18 × 5/84 × 5 = 90/420 - Likewise, for the 2nd fraction, since 60 × 7 = 420,
21/60 = 21 × 7/60 × 7 = 147/420 - Subtract the two like fractions:
90/420 - 147/420 = 90 - 147/420 = -57/420 - After reducing the fraction, the answer is -19/140
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