Add 20/12 and 9/18
1st number: 1 8/12, 2nd number: 9/18
20/12 + 9/18 is 13/6.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 18 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 18 × 2 = 36,
9/18 = 9 × 2/18 × 2 = 18/36 - Add the two like fractions:
60/36 + 18/36 = 60 + 18/36 = 78/36 - 78/36 simplified gives 13/6
- So, 20/12 + 9/18 = 13/6
In mixed form: 21/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/12+9/18 20/24+9/18 20/12+9/36 60/12+9/18 20/12+27/18 20/36+9/18 20/12+9/54 20/12+45/18 20/60+9/18 20/12+9/90 20/12+63/18 20/84+9/18