Add 30/18 and 81/12
1st number: 1 12/18, 2nd number: 6 9/12
30/18 + 81/12 is 101/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 12 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 18 × 2 = 36,
30/18 = 30 × 2/18 × 2 = 60/36 - Likewise, for the 2nd fraction, since 12 × 3 = 36,
81/12 = 81 × 3/12 × 3 = 243/36 - Add the two like fractions:
60/36 + 243/36 = 60 + 243/36 = 303/36 - 303/36 simplified gives 101/12
- So, 30/18 + 81/12 = 101/12
In mixed form: 85/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/18+81/12 30/36+81/12 30/18+81/24 90/18+81/12 30/54+81/12 30/18+81/36 30/90+81/12 30/18+81/60 30/18+81/84