Subtract 80/42 from 3/28
1st number: 3/28, 2nd number: 1 38/42
3/28 - 80/42 is -151/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 42 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 28 × 3 = 84,
3/28 = 3 × 3/28 × 3 = 9/84 - Likewise, for the 2nd fraction, since 42 × 2 = 84,
80/42 = 80 × 2/42 × 2 = 160/84 - Subtract the two like fractions:
9/84 - 160/84 = 9 - 160/84 = -151/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/28-80/42 3/56-80/42 3/28-80/84 9/28-80/42 3/84-80/42 15/28-80/42 21/28-80/42