Add 28/3 and 20/21
1st number: 9 1/3, 2nd number: 20/21
28/3 + 20/21 is 72/7.
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,
28/3 = 28 × 7/3 × 7 = 196/21 - Likewise, for the 2nd fraction, since 21 × 1 = 21,
20/21 = 20 × 1/21 × 1 = 20/21 - Add the two like fractions:
196/21 + 20/21 = 196 + 20/21 = 216/21 - 216/21 simplified gives 72/7
- So, 28/3 + 20/21 = 72/7
In mixed form: 102/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/3+20/21 28/3+40/21 28/6+20/21 28/3+20/42 84/3+20/21 28/3+60/21 28/9+20/21 28/3+20/63 28/15+20/21 28/21+20/21