Subtract 8/72 from 3/42
3/42 - 8/72 is -5/126.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 72 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 42 × 12 = 504,
3/42 = 3 × 12/42 × 12 = 36/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
8/72 = 8 × 7/72 × 7 = 56/504 - Subtract the two like fractions:
36/504 - 56/504 = 36 - 56/504 = -20/504 - After reducing the fraction, the answer is -5/126
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