Subtract 80/18 from 27/42
1st number: 27/42, 2nd number: 4 8/18
27/42 - 80/18 is -479/126.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 42 × 3 = 126,
27/42 = 27 × 3/42 × 3 = 81/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
80/18 = 80 × 7/18 × 7 = 560/126 - Subtract the two like fractions:
81/126 - 560/126 = 81 - 560/126 = -479/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/42-80/18 27/84-80/18 27/42-80/36 81/42-80/18 27/42-80/54 27/42-80/90