Add 28/18 and 21/42
1st number: 1 10/18, 2nd number: 21/42
28/18 + 21/42 is 37/18.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 42 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 18 × 7 = 126,
28/18 = 28 × 7/18 × 7 = 196/126 - Likewise, for the 2nd fraction, since 42 × 3 = 126,
21/42 = 21 × 3/42 × 3 = 63/126 - Add the two like fractions:
196/126 + 63/126 = 196 + 63/126 = 259/126 - 259/126 simplified gives 37/18
- So, 28/18 + 21/42 = 37/18
In mixed form: 21/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/18+21/42 28/36+21/42 28/18+21/84 84/18+21/42 28/18+63/42 28/54+21/42 28/90+21/42