Subtract 81/90 from 2/28
2/28 - 81/90 is -29/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 90 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 28 × 45 = 1260,
2/28 = 2 × 45/28 × 45 = 90/1260 - Likewise, for the 2nd fraction, since 90 × 14 = 1260,
81/90 = 81 × 14/90 × 14 = 1134/1260 - Subtract the two like fractions:
90/1260 - 1134/1260 = 90 - 1134/1260 = -1044/1260 - After reducing the fraction, the answer is -29/35
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