Add 24/28 and 21/9
1st number: 24/28, 2nd number: 2 3/9
24/28 + 21/9 is 67/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 9 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 28 × 9 = 252,
24/28 = 24 × 9/28 × 9 = 216/252 - Likewise, for the 2nd fraction, since 9 × 28 = 252,
21/9 = 21 × 28/9 × 28 = 588/252 - Add the two like fractions:
216/252 + 588/252 = 216 + 588/252 = 804/252 - 804/252 simplified gives 67/21
- So, 24/28 + 21/9 = 67/21
In mixed form: 34/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 48/28+21/9 24/28+42/9 24/56+21/9 24/28+21/18 72/28+21/9 24/28+63/9 24/84+21/9 24/28+21/27 24/28+21/45 24/28+21/63