Subtract 5/21 from 20/15
1st number: 1 5/15, 2nd number: 5/21
20/15 - 5/21 is 23/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 21 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 21 × 5 = 105,
5/21 = 5 × 5/21 × 5 = 25/105 - Subtract the two like fractions:
140/105 - 25/105 = 140 - 25/105 = 115/105 - After reducing the fraction, the answer is 23/21
- In mixed form: 12/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/15-5/21 20/15-10/21 20/30-5/21 20/15-5/42 60/15-5/21 20/15-15/21 20/45-5/21 20/15-5/63 20/15-25/21 20/75-5/21 20/15-35/21