Add 15/12 and 42/30
1st number: 1 3/12, 2nd number: 1 12/30
15/12 + 42/30 is 53/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 30 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 12 × 5 = 60,
15/12 = 15 × 5/12 × 5 = 75/60 - Likewise, for the 2nd fraction, since 30 × 2 = 60,
42/30 = 42 × 2/30 × 2 = 84/60 - Add the two like fractions:
75/60 + 84/60 = 75 + 84/60 = 159/60 - 159/60 simplified gives 53/20
- So, 15/12 + 42/30 = 53/20
In mixed form: 213/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/12+42/30 15/12+84/30 15/24+42/30 15/12+42/60 45/12+42/30 15/36+42/30 15/12+42/90 75/12+42/30 15/60+42/30 15/84+42/30