Subtract 20/63 from 12/72
12/72 - 20/63 is -19/126.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 63 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 72 × 7 = 504,
12/72 = 12 × 7/72 × 7 = 84/504 - Likewise, for the 2nd fraction, since 63 × 8 = 504,
20/63 = 20 × 8/63 × 8 = 160/504 - Subtract the two like fractions:
84/504 - 160/504 = 84 - 160/504 = -76/504 - After reducing the fraction, the answer is -19/126
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