Subtract 20/84 from 15/80
15/80 - 20/84 is -17/336.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 84 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 80 × 21 = 1680,
15/80 = 15 × 21/80 × 21 = 315/1680 - Likewise, for the 2nd fraction, since 84 × 20 = 1680,
20/84 = 20 × 20/84 × 20 = 400/1680 - Subtract the two like fractions:
315/1680 - 400/1680 = 315 - 400/1680 = -85/1680 - After reducing the fraction, the answer is -17/336
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