Subtract 28/7 from 20/15
1st number: 1 5/15, 2nd number: 4 0/7
20/15 - 28/7 is -8/3.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 7 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 15 × 7 = 105,
20/15 = 20 × 7/15 × 7 = 140/105 - Likewise, for the 2nd fraction, since 7 × 15 = 105,
28/7 = 28 × 15/7 × 15 = 420/105 - Subtract the two like fractions:
140/105 - 420/105 = 140 - 420/105 = -280/105 - After reducing the fraction, the answer is -8/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/15-28/7 20/15-56/7 20/30-28/7 20/15-28/14 60/15-28/7 20/15-84/7 20/45-28/7 20/15-28/21 20/75-28/7 20/15-28/35 20/15-28/49