Subtract 27/28 from 42/90
42/90 - 27/28 is -209/420.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 28 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 90 × 14 = 1260,
42/90 = 42 × 14/90 × 14 = 588/1260 - Likewise, for the 2nd fraction, since 28 × 45 = 1260,
27/28 = 27 × 45/28 × 45 = 1215/1260 - Subtract the two like fractions:
588/1260 - 1215/1260 = 588 - 1215/1260 = -627/1260 - After reducing the fraction, the answer is -209/420
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