Add 18/12 and 81/30
1st number: 1 6/12, 2nd number: 2 21/30
18/12 + 81/30 is 21/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 30 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 12 × 5 = 60,
18/12 = 18 × 5/12 × 5 = 90/60 - Likewise, for the 2nd fraction, since 30 × 2 = 60,
81/30 = 81 × 2/30 × 2 = 162/60 - Add the two like fractions:
90/60 + 162/60 = 90 + 162/60 = 252/60 - 252/60 simplified gives 21/5
- So, 18/12 + 81/30 = 21/5
In mixed form: 41/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/12+81/30 18/24+81/30 18/12+81/60 54/12+81/30 18/36+81/30 18/12+81/90 90/12+81/30 18/60+81/30 18/84+81/30