Add 15/18 and 42/56
15/18 + 42/56 is 19/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 56 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 18 × 28 = 504,
15/18 = 15 × 28/18 × 28 = 420/504 - Likewise, for the 2nd fraction, since 56 × 9 = 504,
42/56 = 42 × 9/56 × 9 = 378/504 - Add the two like fractions:
420/504 + 378/504 = 420 + 378/504 = 798/504 - 798/504 simplified gives 19/12
- So, 15/18 + 42/56 = 19/12
In mixed form: 17/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/18+42/56 15/18+84/56 15/36+42/56 45/18+42/56 15/54+42/56 75/18+42/56 15/90+42/56