Subtract 20/90 from 3/84
3/84 - 20/90 is -47/252.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 90 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 84 × 15 = 1260,
3/84 = 3 × 15/84 × 15 = 45/1260 - Likewise, for the 2nd fraction, since 90 × 14 = 1260,
20/90 = 20 × 14/90 × 14 = 280/1260 - Subtract the two like fractions:
45/1260 - 280/1260 = 45 - 280/1260 = -235/1260 - After reducing the fraction, the answer is -47/252
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