Add 21/3 and 28/7
1st number: 7 0/3, 2nd number: 4 0/7
21/3 + 28/7 is 11/1.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 7 is 21
Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 3 × 7 = 21,
21/3 = 21 × 7/3 × 7 = 147/21 - Likewise, for the 2nd fraction, since 7 × 3 = 21,
28/7 = 28 × 3/7 × 3 = 84/21 - Add the two like fractions:
147/21 + 84/21 = 147 + 84/21 = 231/21 - 231/21 simplified gives 11/1
- So, 21/3 + 28/7 = 11/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/3+28/7 21/3+56/7 21/6+28/7 21/3+28/14 63/3+28/7 21/3+84/7 21/9+28/7 21/3+28/21 21/15+28/7 21/3+28/35 21/3+28/49