Subtract 9/84 from 15/21
15/21 - 9/84 is 17/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 84 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
15/21 = 15 × 4/21 × 4 = 60/84 - Likewise, for the 2nd fraction, since 84 × 1 = 84,
9/84 = 9 × 1/84 × 1 = 9/84 - Subtract the two like fractions:
60/84 - 9/84 = 60 - 9/84 = 51/84 - After reducing the fraction, the answer is 17/28
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