Subtract 20/80 from 15/84
15/84 - 20/80 is -1/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 84 × 20 = 1680,
15/84 = 15 × 20/84 × 20 = 300/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
20/80 = 20 × 21/80 × 21 = 420/1680 - Subtract the two like fractions:
300/1680 - 420/1680 = 300 - 420/1680 = -120/1680 - After reducing the fraction, the answer is -1/14
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