Subtract 20/21 from 20/6
1st number: 3 2/6, 2nd number: 20/21
20/6 - 20/21 is 50/21.
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,
20/21 = 20 × 2/21 × 2 = 40/42 - Subtract the two like fractions:
140/42 - 40/42 = 140 - 40/42 = 100/42 - After reducing the fraction, the answer is 50/21
- In mixed form: 28/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/6-20/21 20/6-40/21 20/12-20/21 20/6-20/42 60/6-20/21 20/6-60/21 20/18-20/21 20/6-20/63 20/30-20/21 20/42-20/21