Add 15/20 and 9/28
15/20 + 9/28 is 15/14.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 28 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 20 × 7 = 140,
15/20 = 15 × 7/20 × 7 = 105/140 - Likewise, for the 2nd fraction, since 28 × 5 = 140,
9/28 = 9 × 5/28 × 5 = 45/140 - Add the two like fractions:
105/140 + 45/140 = 105 + 45/140 = 150/140 - 150/140 simplified gives 15/14
- So, 15/20 + 9/28 = 15/14
In mixed form: 11/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/20+9/28 15/20+18/28 15/40+9/28 15/20+9/56 45/20+9/28 15/20+27/28 15/60+9/28 15/20+9/84 75/20+9/28 15/20+45/28 15/20+63/28