Subtract 40/28 from 8/20
1st number: 8/20, 2nd number: 1 12/28
8/20 - 40/28 is -36/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 28 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 20 × 7 = 140,
8/20 = 8 × 7/20 × 7 = 56/140 - Likewise, for the 2nd fraction, since 28 × 5 = 140,
40/28 = 40 × 5/28 × 5 = 200/140 - Subtract the two like fractions:
56/140 - 200/140 = 56 - 200/140 = -144/140 - After reducing the fraction, the answer is -36/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/20-40/28 8/20-80/28 8/40-40/28 8/20-40/56 24/20-40/28 8/60-40/28 8/20-40/84 40/20-40/28 56/20-40/28