Add 42/45 and 21/9
1st number: 42/45, 2nd number: 2 3/9
42/45 + 21/9 is 49/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 9 is 45
Next, find the equivalent fraction of both fractional numbers with denominator 45 - For the 1st fraction, since 45 × 1 = 45,
42/45 = 42 × 1/45 × 1 = 42/45 - Likewise, for the 2nd fraction, since 9 × 5 = 45,
21/9 = 21 × 5/9 × 5 = 105/45 - Add the two like fractions:
42/45 + 105/45 = 42 + 105/45 = 147/45 - 147/45 simplified gives 49/15
- So, 42/45 + 21/9 = 49/15
In mixed form: 34/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/45+21/9 42/45+42/9 42/90+21/9 42/45+21/18 42/45+63/9 42/45+21/27 42/45+21/45 42/45+21/63