Subtract 28/7 from 15/8
1st number: 1 7/8, 2nd number: 4 0/7
15/8 - 28/7 is -17/8.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 7 is 56
Next, find the equivalent fraction of both fractional numbers with denominator 56 - For the 1st fraction, since 8 × 7 = 56,
15/8 = 15 × 7/8 × 7 = 105/56 - Likewise, for the 2nd fraction, since 7 × 8 = 56,
28/7 = 28 × 8/7 × 8 = 224/56 - Subtract the two like fractions:
105/56 - 224/56 = 105 - 224/56 = -119/56 - After reducing the fraction, the answer is -17/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/8-28/7 15/8-56/7 15/16-28/7 15/8-28/14 45/8-28/7 15/8-84/7 15/24-28/7 15/8-28/21 75/8-28/7 15/40-28/7 15/8-28/35 15/56-28/7 15/8-28/49