Subtract 21/10 from 42/27
1st number: 1 15/27, 2nd number: 2 1/10
42/27 - 21/10 is -49/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 10 is 270
Next, find the equivalent fraction of both fractional numbers with denominator 270 - For the 1st fraction, since 27 × 10 = 270,
42/27 = 42 × 10/27 × 10 = 420/270 - Likewise, for the 2nd fraction, since 10 × 27 = 270,
21/10 = 21 × 27/10 × 27 = 567/270 - Subtract the two like fractions:
420/270 - 567/270 = 420 - 567/270 = -147/270 - After reducing the fraction, the answer is -49/90
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