Add 7/42 and 21/4
1st number: 7/42, 2nd number: 5 1/4
7/42 + 21/4 is 65/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 4 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 42 × 2 = 84,
7/42 = 7 × 2/42 × 2 = 14/84 - Likewise, for the 2nd fraction, since 4 × 21 = 84,
21/4 = 21 × 21/4 × 21 = 441/84 - Add the two like fractions:
14/84 + 441/84 = 14 + 441/84 = 455/84 - 455/84 simplified gives 65/12
- So, 7/42 + 21/4 = 65/12
In mixed form: 55/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/42+21/4 7/42+42/4 7/84+21/4 7/42+21/8 21/42+21/4 7/42+63/4 7/42+21/12 35/42+21/4 7/42+21/20 49/42+21/4 7/42+21/28