Add 20/3 and 20/21
1st number: 6 2/3, 2nd number: 20/21
20/3 + 20/21 is 160/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 21 is 21
Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 3 × 7 = 21,
20/3 = 20 × 7/3 × 7 = 140/21 - Likewise, for the 2nd fraction, since 21 × 1 = 21,
20/21 = 20 × 1/21 × 1 = 20/21 - Add the two like fractions:
140/21 + 20/21 = 140 + 20/21 = 160/21 - So, 20/3 + 20/21 = 160/21
In mixed form: 713/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/3+20/21 20/3+40/21 20/6+20/21 20/3+20/42 60/3+20/21 20/3+60/21 20/9+20/21 20/3+20/63 20/15+20/21 20/21+20/21