Subtract 21/6 from 20/15
1st number: 1 5/15, 2nd number: 3 3/6
20/15 - 21/6 is -13/6.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 6 is 30
Next, find the equivalent fraction of both fractional numbers with denominator 30 - For the 1st fraction, since 15 × 2 = 30,
20/15 = 20 × 2/15 × 2 = 40/30 - Likewise, for the 2nd fraction, since 6 × 5 = 30,
21/6 = 21 × 5/6 × 5 = 105/30 - Subtract the two like fractions:
40/30 - 105/30 = 40 - 105/30 = -65/30 - After reducing the fraction, the answer is -13/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/15-21/6 20/15-42/6 20/30-21/6 20/15-21/12 60/15-21/6 20/15-63/6 20/45-21/6 20/15-21/18 20/75-21/6 20/15-21/30 20/15-21/42