Subtract 40/20 from 8/28
1st number: 8/28, 2nd number: 2 0/20
8/28 - 40/20 is -12/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 20 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 28 × 5 = 140,
8/28 = 8 × 5/28 × 5 = 40/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
40/20 = 40 × 7/20 × 7 = 280/140 - Subtract the two like fractions:
40/140 - 280/140 = 40 - 280/140 = -240/140 - After reducing the fraction, the answer is -12/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/28-40/20 8/28-80/20 8/56-40/20 24/28-40/20 8/84-40/20 8/28-40/60 40/28-40/20 56/28-40/20