Add 15/42 and 21/14
1st number: 15/42, 2nd number: 1 7/14
15/42 + 21/14 is 13/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 14 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 42 × 1 = 42,
15/42 = 15 × 1/42 × 1 = 15/42 - Likewise, for the 2nd fraction, since 14 × 3 = 42,
21/14 = 21 × 3/14 × 3 = 63/42 - Add the two like fractions:
15/42 + 63/42 = 15 + 63/42 = 78/42 - 78/42 simplified gives 13/7
- So, 15/42 + 21/14 = 13/7
In mixed form: 16/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/42+21/14 15/42+42/14 15/84+21/14 15/42+21/28 45/42+21/14 15/42+63/14 15/42+21/42 75/42+21/14 15/42+21/70 15/42+21/98