Add 18/20 and 12/9
1st number: 18/20, 2nd number: 1 3/9
18/20 + 12/9 is 67/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 9 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
18/20 = 18 × 9/20 × 9 = 162/180 - Likewise, for the 2nd fraction, since 9 × 20 = 180,
12/9 = 12 × 20/9 × 20 = 240/180 - Add the two like fractions:
162/180 + 240/180 = 162 + 240/180 = 402/180 - 402/180 simplified gives 67/30
- So, 18/20 + 12/9 = 67/30
In mixed form: 27/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/20+12/9 18/20+24/9 18/40+12/9 18/20+12/18 54/20+12/9 18/20+36/9 18/60+12/9 18/20+12/27 90/20+12/9 18/20+60/9 18/20+12/45 18/20+84/9 18/20+12/63