Add 1/28 and 21/20
1st number: 1/28, 2nd number: 1 1/20
1/28 + 21/20 is 38/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 20 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 28 × 5 = 140,
1/28 = 1 × 5/28 × 5 = 5/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
21/20 = 21 × 7/20 × 7 = 147/140 - Add the two like fractions:
5/140 + 147/140 = 5 + 147/140 = 152/140 - 152/140 simplified gives 38/35
- So, 1/28 + 21/20 = 38/35
In mixed form: 13/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/28+21/20 1/28+42/20 1/56+21/20 1/28+21/40 3/28+21/20 1/28+63/20 1/84+21/20 1/28+21/60 5/28+21/20 7/28+21/20