Add 18/20 and 18/90
18/20 + 18/90 is 11/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
18/20 = 18 × 9/20 × 9 = 162/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
18/90 = 18 × 2/90 × 2 = 36/180 - Add the two like fractions:
162/180 + 36/180 = 162 + 36/180 = 198/180 - 198/180 simplified gives 11/10
- So, 18/20 + 18/90 = 11/10
In mixed form: 11/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/20+18/90 18/20+36/90 18/40+18/90 54/20+18/90 18/20+54/90 18/60+18/90 90/20+18/90