Add 20/30 and 18/90
20/30 + 18/90 is 13/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 30 × 3 = 90,
20/30 = 20 × 3/30 × 3 = 60/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
18/90 = 18 × 1/90 × 1 = 18/90 - Add the two like fractions:
60/90 + 18/90 = 60 + 18/90 = 78/90 - 78/90 simplified gives 13/15
- So, 20/30 + 18/90 = 13/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/30+18/90 20/30+36/90 20/60+18/90 60/30+18/90 20/30+54/90 20/90+18/90