Subtract 3/72 from 42/80
42/80 - 3/72 is 29/60.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 72 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 80 × 9 = 720,
42/80 = 42 × 9/80 × 9 = 378/720 - Likewise, for the 2nd fraction, since 72 × 10 = 720,
3/72 = 3 × 10/72 × 10 = 30/720 - Subtract the two like fractions:
378/720 - 30/720 = 378 - 30/720 = 348/720 - After reducing the fraction, the answer is 29/60
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