Add 42/12 and 81/15
1st number: 3 6/12, 2nd number: 5 6/15
42/12 + 81/15 is 89/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 15 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 12 × 5 = 60,
42/12 = 42 × 5/12 × 5 = 210/60 - Likewise, for the 2nd fraction, since 15 × 4 = 60,
81/15 = 81 × 4/15 × 4 = 324/60 - Add the two like fractions:
210/60 + 324/60 = 210 + 324/60 = 534/60 - 534/60 simplified gives 89/10
- So, 42/12 + 81/15 = 89/10
In mixed form: 89/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/12+81/15 42/24+81/15 42/12+81/30 42/36+81/15 42/12+81/45 42/60+81/15 42/12+81/75 42/84+81/15