Add 15/21 and 18/4
1st number: 15/21, 2nd number: 4 2/4
15/21 + 18/4 is 73/14.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 4 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
15/21 = 15 × 4/21 × 4 = 60/84 - Likewise, for the 2nd fraction, since 4 × 21 = 84,
18/4 = 18 × 21/4 × 21 = 378/84 - Add the two like fractions:
60/84 + 378/84 = 60 + 378/84 = 438/84 - 438/84 simplified gives 73/14
- So, 15/21 + 18/4 = 73/14
In mixed form: 53/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/21+18/4 15/21+36/4 15/42+18/4 15/21+18/8 45/21+18/4 15/21+54/4 15/63+18/4 15/21+18/12 75/21+18/4 15/21+90/4 15/21+18/20 15/21+18/28