Subtract 20/7 from 20/15
1st number: 1 5/15, 2nd number: 2 6/7
20/15 - 20/7 is -32/21.
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,
20/7 = 20 × 15/7 × 15 = 300/105 - Subtract the two like fractions:
140/105 - 300/105 = 140 - 300/105 = -160/105 - After reducing the fraction, the answer is -32/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/15-20/7 20/15-40/7 20/30-20/7 20/15-20/14 60/15-20/7 20/15-60/7 20/45-20/7 20/15-20/21 20/75-20/7 20/15-20/35 20/15-20/49