Subtract 16/21 from 20/15
1st number: 1 5/15, 2nd number: 16/21
20/15 - 16/21 is 4/7.
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,
16/21 = 16 × 5/21 × 5 = 80/105 - Subtract the two like fractions:
140/105 - 80/105 = 140 - 80/105 = 60/105 - After reducing the fraction, the answer is 4/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/15-16/21 20/15-32/21 20/30-16/21 20/15-16/42 60/15-16/21 20/15-48/21 20/45-16/21 20/15-16/63 20/15-80/21 20/75-16/21