Add 42/15 and 81/36
1st number: 2 12/15, 2nd number: 2 9/36
42/15 + 81/36 is 101/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 36 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 15 × 12 = 180,
42/15 = 42 × 12/15 × 12 = 504/180 - Likewise, for the 2nd fraction, since 36 × 5 = 180,
81/36 = 81 × 5/36 × 5 = 405/180 - Add the two like fractions:
504/180 + 405/180 = 504 + 405/180 = 909/180 - 909/180 simplified gives 101/20
- So, 42/15 + 81/36 = 101/20
In mixed form: 51/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/15+81/36 42/30+81/36 42/15+81/72 42/45+81/36 42/75+81/36