Add 20/12 and 28/9
1st number: 1 8/12, 2nd number: 3 1/9
20/12 + 28/9 is 43/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 9 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 12 × 3 = 36,
20/12 = 20 × 3/12 × 3 = 60/36 - Likewise, for the 2nd fraction, since 9 × 4 = 36,
28/9 = 28 × 4/9 × 4 = 112/36 - Add the two like fractions:
60/36 + 112/36 = 60 + 112/36 = 172/36 - 172/36 simplified gives 43/9
- So, 20/12 + 28/9 = 43/9
In mixed form: 47/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/12+28/9 20/12+56/9 20/24+28/9 20/12+28/18 60/12+28/9 20/12+84/9 20/36+28/9 20/12+28/27 20/60+28/9 20/12+28/45 20/84+28/9 20/12+28/63