Add 21/42 and 35/28
1st number: 21/42, 2nd number: 1 7/28
21/42 + 35/28 is 7/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 28 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 42 × 2 = 84,
21/42 = 21 × 2/42 × 2 = 42/84 - Likewise, for the 2nd fraction, since 28 × 3 = 84,
35/28 = 35 × 3/28 × 3 = 105/84 - Add the two like fractions:
42/84 + 105/84 = 42 + 105/84 = 147/84 - 147/84 simplified gives 7/4
- So, 21/42 + 35/28 = 7/4
In mixed form: 13/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 21/42+70/28 21/84+35/28 21/42+35/56 63/42+35/28 21/42+35/84