Add 25/42 and 15/21
25/42 + 15/21 is 55/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 42 × 1 = 42,
25/42 = 25 × 1/42 × 1 = 25/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
15/21 = 15 × 2/21 × 2 = 30/42 - Add the two like fractions:
25/42 + 30/42 = 25 + 30/42 = 55/42 - So, 25/42 + 15/21 = 55/42
In mixed form: 113/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/42+15/21 25/42+30/21 25/84+15/21 25/42+15/42 75/42+15/21 25/42+45/21 25/42+15/63 25/42+75/21