Subtract 18/8 from 7/28
1st number: 7/28, 2nd number: 2 2/8
7/28 - 18/8 is -2/1.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 8 is 56
Next, find the equivalent fraction of both fractional numbers with denominator 56 - For the 1st fraction, since 28 × 2 = 56,
7/28 = 7 × 2/28 × 2 = 14/56 - Likewise, for the 2nd fraction, since 8 × 7 = 56,
18/8 = 18 × 7/8 × 7 = 126/56 - Subtract the two like fractions:
14/56 - 126/56 = 14 - 126/56 = -112/56 - After reducing the fraction, the answer is -2/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/28-18/8 7/28-36/8 7/56-18/8 7/28-18/16 21/28-18/8 7/28-54/8 7/84-18/8 7/28-18/24 35/28-18/8 7/28-90/8 7/28-18/40 49/28-18/8 7/28-18/56