Add 28/5 and 21/45
1st number: 5 3/5, 2nd number: 21/45
28/5 + 21/45 is 91/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 45 is 45
Next, find the equivalent fraction of both fractional numbers with denominator 45 - For the 1st fraction, since 5 × 9 = 45,
28/5 = 28 × 9/5 × 9 = 252/45 - Likewise, for the 2nd fraction, since 45 × 1 = 45,
21/45 = 21 × 1/45 × 1 = 21/45 - Add the two like fractions:
252/45 + 21/45 = 252 + 21/45 = 273/45 - 273/45 simplified gives 91/15
- So, 28/5 + 21/45 = 91/15
In mixed form: 61/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/5+21/45 28/5+42/45 28/10+21/45 28/5+21/90 84/5+21/45 28/5+63/45 28/15+21/45 28/25+21/45 28/35+21/45