Add 15/7 and 28/20
1st number: 2 1/7, 2nd number: 1 8/20
15/7 + 28/20 is 124/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 20 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 7 × 20 = 140,
15/7 = 15 × 20/7 × 20 = 300/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
28/20 = 28 × 7/20 × 7 = 196/140 - Add the two like fractions:
300/140 + 196/140 = 300 + 196/140 = 496/140 - 496/140 simplified gives 124/35
- So, 15/7 + 28/20 = 124/35
In mixed form: 319/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/7+28/20 15/7+56/20 15/14+28/20 15/7+28/40 45/7+28/20 15/7+84/20 15/21+28/20 15/7+28/60 75/7+28/20 15/35+28/20 15/49+28/20