Add 30/18 and 80/90
1st number: 1 12/18, 2nd number: 80/90
30/18 + 80/90 is 23/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 18 × 5 = 90,
30/18 = 30 × 5/18 × 5 = 150/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
80/90 = 80 × 1/90 × 1 = 80/90 - Add the two like fractions:
150/90 + 80/90 = 150 + 80/90 = 230/90 - 230/90 simplified gives 23/9
- So, 30/18 + 80/90 = 23/9
In mixed form: 25/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/18+80/90 30/36+80/90 90/18+80/90 30/54+80/90 30/90+80/90