Add 18/30 and 15/20
18/30 + 15/20 is 27/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 20 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 30 × 2 = 60,
18/30 = 18 × 2/30 × 2 = 36/60 - Likewise, for the 2nd fraction, since 20 × 3 = 60,
15/20 = 15 × 3/20 × 3 = 45/60 - Add the two like fractions:
36/60 + 45/60 = 36 + 45/60 = 81/60 - 81/60 simplified gives 27/20
- So, 18/30 + 15/20 = 27/20
In mixed form: 17/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/30+15/20 18/30+30/20 18/60+15/20 18/30+15/40 54/30+15/20 18/30+45/20 18/90+15/20 18/30+15/60 90/30+15/20 18/30+75/20