Add 3/7 and 28/20
1st number: 3/7, 2nd number: 1 8/20
3/7 + 28/20 is 64/35.
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,
3/7 = 3 × 20/7 × 20 = 60/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
28/20 = 28 × 7/20 × 7 = 196/140 - Add the two like fractions:
60/140 + 196/140 = 60 + 196/140 = 256/140 - 256/140 simplified gives 64/35
- So, 3/7 + 28/20 = 64/35
In mixed form: 129/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/7+28/20 3/7+56/20 3/14+28/20 3/7+28/40 9/7+28/20 3/7+84/20 3/21+28/20 3/7+28/60 15/7+28/20 3/35+28/20 21/7+28/20 3/49+28/20