Add 5/45 and 21/20
1st number: 5/45, 2nd number: 1 1/20
5/45 + 21/20 is 209/180.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 45 × 4 = 180,
5/45 = 5 × 4/45 × 4 = 20/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
21/20 = 21 × 9/20 × 9 = 189/180 - Add the two like fractions:
20/180 + 189/180 = 20 + 189/180 = 209/180 - So, 5/45 + 21/20 = 209/180
In mixed form: 129/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/45+21/20 5/45+42/20 5/90+21/20 5/45+21/40 15/45+21/20 5/45+63/20 5/45+21/60 25/45+21/20 35/45+21/20