Add 20/5 and 21/9
1st number: 4 0/5, 2nd number: 2 3/9
20/5 + 21/9 is 19/3.
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,
20/5 = 20 × 9/5 × 9 = 180/45 - Likewise, for the 2nd fraction, since 9 × 5 = 45,
21/9 = 21 × 5/9 × 5 = 105/45 - Add the two like fractions:
180/45 + 105/45 = 180 + 105/45 = 285/45 - 285/45 simplified gives 19/3
- So, 20/5 + 21/9 = 19/3
In mixed form: 61/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/5+21/9 20/5+42/9 20/10+21/9 20/5+21/18 60/5+21/9 20/5+63/9 20/15+21/9 20/5+21/27 20/25+21/9 20/5+21/45 20/35+21/9 20/5+21/63