Add 28/36 and 20/15
1st number: 28/36, 2nd number: 1 5/15
28/36 + 20/15 is 19/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 15 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 36 × 5 = 180,
28/36 = 28 × 5/36 × 5 = 140/180 - Likewise, for the 2nd fraction, since 15 × 12 = 180,
20/15 = 20 × 12/15 × 12 = 240/180 - Add the two like fractions:
140/180 + 240/180 = 140 + 240/180 = 380/180 - 380/180 simplified gives 19/9
- So, 28/36 + 20/15 = 19/9
In mixed form: 21/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/36+20/15 28/36+40/15 28/72+20/15 28/36+20/30 84/36+20/15 28/36+60/15 28/36+20/45 28/36+20/75