Add 15/20 and 81/9
1st number: 15/20, 2nd number: 9 0/9
15/20 + 81/9 is 39/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 9 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
15/20 = 15 × 9/20 × 9 = 135/180 - Likewise, for the 2nd fraction, since 9 × 20 = 180,
81/9 = 81 × 20/9 × 20 = 1620/180 - Add the two like fractions:
135/180 + 1620/180 = 135 + 1620/180 = 1755/180 - 1755/180 simplified gives 39/4
- So, 15/20 + 81/9 = 39/4
In mixed form: 93/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/20+81/9 15/40+81/9 15/20+81/18 45/20+81/9 15/60+81/9 15/20+81/27 75/20+81/9 15/20+81/45 15/20+81/63