Subtract 28/7 from 15/20
1st number: 15/20, 2nd number: 4 0/7
15/20 - 28/7 is -13/4.
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,
15/20 = 15 × 7/20 × 7 = 105/140 - Likewise, for the 2nd fraction, since 7 × 20 = 140,
28/7 = 28 × 20/7 × 20 = 560/140 - Subtract the two like fractions:
105/140 - 560/140 = 105 - 560/140 = -455/140 - After reducing the fraction, the answer is -13/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/20-28/7 15/20-56/7 15/40-28/7 15/20-28/14 45/20-28/7 15/20-84/7 15/60-28/7 15/20-28/21 75/20-28/7 15/20-28/35 15/20-28/49