Subtract 9/72 from 12/42
12/42 - 9/72 is 9/56.
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,
12/42 = 12 × 12/42 × 12 = 144/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
9/72 = 9 × 7/72 × 7 = 63/504 - Subtract the two like fractions:
144/504 - 63/504 = 144 - 63/504 = 81/504 - After reducing the fraction, the answer is 9/56
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