Add 15/20 and 3/7
15/20 + 3/7 is 33/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 7 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 7 × 20 = 140,
3/7 = 3 × 20/7 × 20 = 60/140 - Add the two like fractions:
105/140 + 60/140 = 105 + 60/140 = 165/140 - 165/140 simplified gives 33/28
- So, 15/20 + 3/7 = 33/28
In mixed form: 15/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/20+3/7 15/20+6/7 15/40+3/7 15/20+3/14 45/20+3/7 15/20+9/7 15/60+3/7 15/20+3/21 75/20+3/7 15/20+15/7 15/20+3/35 15/20+21/7 15/20+3/49