Subtract 21/72 from 8/84
8/84 - 21/72 is -11/56.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 72 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 84 × 6 = 504,
8/84 = 8 × 6/84 × 6 = 48/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
21/72 = 21 × 7/72 × 7 = 147/504 - Subtract the two like fractions:
48/504 - 147/504 = 48 - 147/504 = -99/504 - After reducing the fraction, the answer is -11/56
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