Subtract 8/6 from 20/21
1st number: 20/21, 2nd number: 1 2/6
20/21 - 8/6 is -8/21.
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,
8/6 = 8 × 7/6 × 7 = 56/42 - Subtract the two like fractions:
40/42 - 56/42 = 40 - 56/42 = -16/42 - After reducing the fraction, the answer is -8/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/21-8/6 20/21-16/6 20/42-8/6 20/21-8/12 60/21-8/6 20/21-24/6 20/63-8/6 20/21-8/18 20/21-40/6 20/21-8/30 20/21-56/6 20/21-8/42