Add 20/12 and 30/9
1st number: 1 8/12, 2nd number: 3 3/9
20/12 + 30/9 is 5/1.
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,
30/9 = 30 × 4/9 × 4 = 120/36 - Add the two like fractions:
60/36 + 120/36 = 60 + 120/36 = 180/36 - 180/36 simplified gives 5/1
- So, 20/12 + 30/9 = 5/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/12+30/9 20/12+60/9 20/24+30/9 20/12+30/18 60/12+30/9 20/12+90/9 20/36+30/9 20/12+30/27 20/60+30/9 20/12+30/45 20/84+30/9 20/12+30/63