Subtract 20/72 from 7/63
7/63 - 20/72 is -1/6.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 72 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 63 × 8 = 504,
7/63 = 7 × 8/63 × 8 = 56/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
20/72 = 20 × 7/72 × 7 = 140/504 - Subtract the two like fractions:
56/504 - 140/504 = 56 - 140/504 = -84/504 - After reducing the fraction, the answer is -1/6
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