Subtract 18/20 from 15/63
15/63 - 18/20 is -139/210.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 20 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 63 × 20 = 1260,
15/63 = 15 × 20/63 × 20 = 300/1260 - Likewise, for the 2nd fraction, since 20 × 63 = 1260,
18/20 = 18 × 63/20 × 63 = 1134/1260 - Subtract the two like fractions:
300/1260 - 1134/1260 = 300 - 1134/1260 = -834/1260 - After reducing the fraction, the answer is -139/210
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