Add 21/12 and 30/10
1st number: 1 9/12, 2nd number: 3 0/10
21/12 + 30/10 is 19/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 10 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 12 × 5 = 60,
21/12 = 21 × 5/12 × 5 = 105/60 - Likewise, for the 2nd fraction, since 10 × 6 = 60,
30/10 = 30 × 6/10 × 6 = 180/60 - Add the two like fractions:
105/60 + 180/60 = 105 + 180/60 = 285/60 - 285/60 simplified gives 19/4
- So, 21/12 + 30/10 = 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: 42/12+30/10 21/12+60/10 21/24+30/10 21/12+30/20 63/12+30/10 21/12+90/10 21/36+30/10 21/60+30/10 21/12+30/50 21/84+30/10 21/12+30/70