Subtract 4/5 from 18/28
18/28 - 4/5 is -11/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 5 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 28 × 5 = 140,
18/28 = 18 × 5/28 × 5 = 90/140 - Likewise, for the 2nd fraction, since 5 × 28 = 140,
4/5 = 4 × 28/5 × 28 = 112/140 - Subtract the two like fractions:
90/140 - 112/140 = 90 - 112/140 = -22/140 - After reducing the fraction, the answer is -11/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/28-4/5 18/28-8/5 18/56-4/5 18/28-4/10 54/28-4/5 18/28-12/5 18/84-4/5 18/28-4/15 90/28-4/5 18/28-20/5 18/28-4/25 18/28-28/5 18/28-4/35