Subtract 15/21 from 21/54
21/54 - 15/21 is -41/126.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 54 and 21 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 54 × 7 = 378,
21/54 = 21 × 7/54 × 7 = 147/378 - Likewise, for the 2nd fraction, since 21 × 18 = 378,
15/21 = 15 × 18/21 × 18 = 270/378 - Subtract the two like fractions:
147/378 - 270/378 = 147 - 270/378 = -123/378 - After reducing the fraction, the answer is -41/126
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