Subtract 21/27 from 42/60
42/60 - 21/27 is -7/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 60 and 27 is 540
Next, find the equivalent fraction of both fractional numbers with denominator 540 - For the 1st fraction, since 60 × 9 = 540,
42/60 = 42 × 9/60 × 9 = 378/540 - Likewise, for the 2nd fraction, since 27 × 20 = 540,
21/27 = 21 × 20/27 × 20 = 420/540 - Subtract the two like fractions:
378/540 - 420/540 = 378 - 420/540 = -42/540 - After reducing the fraction, the answer is -7/90
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