Subtract 28/7 from 30/8
1st number: 3 6/8, 2nd number: 4 0/7
30/8 - 28/7 is -1/4.
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,
30/8 = 30 × 7/8 × 7 = 210/56 - Likewise, for the 2nd fraction, since 7 × 8 = 56,
28/7 = 28 × 8/7 × 8 = 224/56 - Subtract the two like fractions:
210/56 - 224/56 = 210 - 224/56 = -14/56 - After reducing the fraction, the answer is -1/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/8-28/7 30/8-56/7 30/16-28/7 30/8-28/14 90/8-28/7 30/8-84/7 30/24-28/7 30/8-28/21 30/40-28/7 30/8-28/35 30/56-28/7 30/8-28/49