Add 90/18 and 30/20
1st number: 5 0/18, 2nd number: 1 10/20
90/18 + 30/20 is 13/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 18 × 10 = 180,
90/18 = 90 × 10/18 × 10 = 900/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
30/20 = 30 × 9/20 × 9 = 270/180 - Add the two like fractions:
900/180 + 270/180 = 900 + 270/180 = 1170/180 - 1170/180 simplified gives 13/2
- So, 90/18 + 30/20 = 13/2
In mixed form: 61/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/18+60/20 90/36+30/20 90/18+30/40 90/18+90/20 90/54+30/20 90/18+30/60