Subtract 28/6 from 20/21
1st number: 20/21, 2nd number: 4 4/6
20/21 - 28/6 is -26/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 6 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 21 × 2 = 42,
20/21 = 20 × 2/21 × 2 = 40/42 - Likewise, for the 2nd fraction, since 6 × 7 = 42,
28/6 = 28 × 7/6 × 7 = 196/42 - Subtract the two like fractions:
40/42 - 196/42 = 40 - 196/42 = -156/42 - After reducing the fraction, the answer is -26/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/21-28/6 20/21-56/6 20/42-28/6 20/21-28/12 60/21-28/6 20/21-84/6 20/63-28/6 20/21-28/18 20/21-28/30 20/21-28/42