Subtract 18/28 from 1/5
1/5 - 18/28 is -31/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 28 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 5 × 28 = 140,
1/5 = 1 × 28/5 × 28 = 28/140 - Likewise, for the 2nd fraction, since 28 × 5 = 140,
18/28 = 18 × 5/28 × 5 = 90/140 - Subtract the two like fractions:
28/140 - 90/140 = 28 - 90/140 = -62/140 - After reducing the fraction, the answer is -31/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/5-18/28 1/5-36/28 1/10-18/28 1/5-18/56 3/5-18/28 1/5-54/28 1/15-18/28 1/5-18/84 1/5-90/28 1/25-18/28 7/5-18/28 1/35-18/28