Add 21/5 and 28/90
1st number: 4 1/5, 2nd number: 28/90
21/5 + 28/90 is 203/45.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 5 × 18 = 90,
21/5 = 21 × 18/5 × 18 = 378/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
28/90 = 28 × 1/90 × 1 = 28/90 - Add the two like fractions:
378/90 + 28/90 = 378 + 28/90 = 406/90 - 406/90 simplified gives 203/45
- So, 21/5 + 28/90 = 203/45
In mixed form: 423/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/5+28/90 21/5+56/90 21/10+28/90 63/5+28/90 21/5+84/90 21/15+28/90 21/25+28/90 21/35+28/90