Add 28/7 and 21/9
1st number: 4 0/7, 2nd number: 2 3/9
28/7 + 21/9 is 19/3.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 9 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 7 × 9 = 63,
28/7 = 28 × 9/7 × 9 = 252/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
21/9 = 21 × 7/9 × 7 = 147/63 - Add the two like fractions:
252/63 + 147/63 = 252 + 147/63 = 399/63 - 399/63 simplified gives 19/3
- So, 28/7 + 21/9 = 19/3
In mixed form: 61/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/7+21/9 28/7+42/9 28/14+21/9 28/7+21/18 84/7+21/9 28/7+63/9 28/21+21/9 28/7+21/27 28/35+21/9 28/7+21/45 28/49+21/9 28/7+21/63