Add 21/9 and 9/28
1st number: 2 3/9, 2nd number: 9/28
21/9 + 9/28 is 223/84.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 28 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 9 × 28 = 252,
21/9 = 21 × 28/9 × 28 = 588/252 - Likewise, for the 2nd fraction, since 28 × 9 = 252,
9/28 = 9 × 9/28 × 9 = 81/252 - Add the two like fractions:
588/252 + 81/252 = 588 + 81/252 = 669/252 - 669/252 simplified gives 223/84
- So, 21/9 + 9/28 = 223/84
In mixed form: 255/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/9+9/28 21/9+18/28 21/18+9/28 21/9+9/56 63/9+9/28 21/9+27/28 21/27+9/28 21/9+9/84 21/9+45/28 21/45+9/28 21/9+63/28 21/63+9/28