Add 72/9 and 81/18
1st number: 8 0/9, 2nd number: 4 9/18
72/9 + 81/18 is 25/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 18 is 18
Next, find the equivalent fraction of both fractional numbers with denominator 18 - For the 1st fraction, since 9 × 2 = 18,
72/9 = 72 × 2/9 × 2 = 144/18 - Likewise, for the 2nd fraction, since 18 × 1 = 18,
81/18 = 81 × 1/18 × 1 = 81/18 - Add the two like fractions:
144/18 + 81/18 = 144 + 81/18 = 225/18 - 225/18 simplified gives 25/2
- So, 72/9 + 81/18 = 25/2
In mixed form: 121/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/18+81/18 72/9+81/36 72/27+81/18 72/9+81/54 72/45+81/18 72/9+81/90 72/63+81/18