Add 1/45 and 21/18
1st number: 1/45, 2nd number: 1 3/18
1/45 + 21/18 is 107/90.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 45 × 2 = 90,
1/45 = 1 × 2/45 × 2 = 2/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
21/18 = 21 × 5/18 × 5 = 105/90 - Add the two like fractions:
2/90 + 105/90 = 2 + 105/90 = 107/90 - So, 1/45 + 21/18 = 107/90
In mixed form: 117/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/45+21/18 1/45+42/18 1/90+21/18 1/45+21/36 3/45+21/18 1/45+63/18 1/45+21/54 5/45+21/18 1/45+21/90 7/45+21/18