Add 30/10 and 21/12
1st number: 3 0/10, 2nd number: 1 9/12
30/10 + 21/12 is 19/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 12 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 10 × 6 = 60,
30/10 = 30 × 6/10 × 6 = 180/60 - Likewise, for the 2nd fraction, since 12 × 5 = 60,
21/12 = 21 × 5/12 × 5 = 105/60 - Add the two like fractions:
180/60 + 105/60 = 180 + 105/60 = 285/60 - 285/60 simplified gives 19/4
- So, 30/10 + 21/12 = 19/4
In mixed form: 43/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/10+21/12 30/10+42/12 30/20+21/12 30/10+21/24 90/10+21/12 30/10+63/12 30/10+21/36 30/50+21/12 30/10+21/60 30/70+21/12 30/10+21/84