Subtract 30/8 from 5/7
1st number: 5/7, 2nd number: 3 6/8
5/7 - 30/8 is -85/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 8 is 56
Next, find the equivalent fraction of both fractional numbers with denominator 56 - For the 1st fraction, since 7 × 8 = 56,
5/7 = 5 × 8/7 × 8 = 40/56 - Likewise, for the 2nd fraction, since 8 × 7 = 56,
30/8 = 30 × 7/8 × 7 = 210/56 - Subtract the two like fractions:
40/56 - 210/56 = 40 - 210/56 = -170/56 - After reducing the fraction, the answer is -85/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/7-30/8 5/7-60/8 5/14-30/8 5/7-30/16 15/7-30/8 5/7-90/8 5/21-30/8 5/7-30/24 25/7-30/8 5/35-30/8 5/7-30/40 35/7-30/8 5/49-30/8 5/7-30/56