Subtract 7/72 from 21/54
21/54 - 7/72 is 7/24.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 54 and 72 is 216
Next, find the equivalent fraction of both fractional numbers with denominator 216 - For the 1st fraction, since 54 × 4 = 216,
21/54 = 21 × 4/54 × 4 = 84/216 - Likewise, for the 2nd fraction, since 72 × 3 = 216,
7/72 = 7 × 3/72 × 3 = 21/216 - Subtract the two like fractions:
84/216 - 21/216 = 84 - 21/216 = 63/216 - After reducing the fraction, the answer is 7/24
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