Subtract 15/21 from 18/84
18/84 - 15/21 is -1/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 84 × 1 = 84,
18/84 = 18 × 1/84 × 1 = 18/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
15/21 = 15 × 4/21 × 4 = 60/84 - Subtract the two like fractions:
18/84 - 60/84 = 18 - 60/84 = -42/84 - After reducing the fraction, the answer is -1/2
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