Add 28/20 and 21/24
1st number: 1 8/20, 2nd number: 21/24
28/20 + 21/24 is 91/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 24 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 20 × 6 = 120,
28/20 = 28 × 6/20 × 6 = 168/120 - Likewise, for the 2nd fraction, since 24 × 5 = 120,
21/24 = 21 × 5/24 × 5 = 105/120 - Add the two like fractions:
168/120 + 105/120 = 168 + 105/120 = 273/120 - 273/120 simplified gives 91/40
- So, 28/20 + 21/24 = 91/40
In mixed form: 211/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/20+21/24 28/20+42/24 28/40+21/24 28/20+21/48 84/20+21/24 28/20+63/24 28/60+21/24 28/20+21/72