Subtract 28/7 from 10/20
1st number: 10/20, 2nd number: 4 0/7
10/20 - 28/7 is -7/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 7 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 20 × 7 = 140,
10/20 = 10 × 7/20 × 7 = 70/140 - Likewise, for the 2nd fraction, since 7 × 20 = 140,
28/7 = 28 × 20/7 × 20 = 560/140 - Subtract the two like fractions:
70/140 - 560/140 = 70 - 560/140 = -490/140 - After reducing the fraction, the answer is -7/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/20-56/7 10/40-28/7 10/20-28/14 30/20-28/7 10/20-84/7 10/60-28/7 10/20-28/21 50/20-28/7 10/20-28/35 70/20-28/7 10/20-28/49