Subtract 28/21 from 20/6
1st number: 3 2/6, 2nd number: 1 7/21
20/6 - 28/21 is 2/1.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 6 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 6 × 7 = 42,
20/6 = 20 × 7/6 × 7 = 140/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
28/21 = 28 × 2/21 × 2 = 56/42 - Subtract the two like fractions:
140/42 - 56/42 = 140 - 56/42 = 84/42 - After reducing the fraction, the answer is 2/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/6-28/21 20/6-56/21 20/12-28/21 20/6-28/42 60/6-28/21 20/6-84/21 20/18-28/21 20/6-28/63 20/30-28/21 20/42-28/21