Add 20/15 and 15/9
1st number: 1 5/15, 2nd number: 1 6/9
20/15 + 15/9 is 3/1.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 9 is 45
Next, find the equivalent fraction of both fractional numbers with denominator 45 - For the 1st fraction, since 15 × 3 = 45,
20/15 = 20 × 3/15 × 3 = 60/45 - Likewise, for the 2nd fraction, since 9 × 5 = 45,
15/9 = 15 × 5/9 × 5 = 75/45 - Add the two like fractions:
60/45 + 75/45 = 60 + 75/45 = 135/45 - 135/45 simplified gives 3/1
- So, 20/15 + 15/9 = 3/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/15+15/9 20/15+30/9 20/30+15/9 20/15+15/18 60/15+15/9 20/15+45/9 20/45+15/9 20/15+15/27 20/15+75/9 20/75+15/9 20/15+15/45 20/15+15/63