Add 1/5 and 21/9
1st number: 1/5, 2nd number: 2 3/9
1/5 + 21/9 is 38/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 9 is 45
Next, find the equivalent fraction of both fractional numbers with denominator 45 - For the 1st fraction, since 5 × 9 = 45,
1/5 = 1 × 9/5 × 9 = 9/45 - Likewise, for the 2nd fraction, since 9 × 5 = 45,
21/9 = 21 × 5/9 × 5 = 105/45 - Add the two like fractions:
9/45 + 105/45 = 9 + 105/45 = 114/45 - 114/45 simplified gives 38/15
- So, 1/5 + 21/9 = 38/15
In mixed form: 28/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/5+21/9 1/5+42/9 1/10+21/9 1/5+21/18 3/5+21/9 1/5+63/9 1/15+21/9 1/5+21/27 1/25+21/9 1/5+21/45 7/5+21/9 1/35+21/9 1/5+21/63