Add 21/12 and 21/10
1st number: 1 9/12, 2nd number: 2 1/10
21/12 + 21/10 is 77/20.
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,
21/10 = 21 × 6/10 × 6 = 126/60 - Add the two like fractions:
105/60 + 126/60 = 105 + 126/60 = 231/60 - 231/60 simplified gives 77/20
- So, 21/12 + 21/10 = 77/20
In mixed form: 317/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/12+21/10 21/12+42/10 21/24+21/10 21/12+21/20 63/12+21/10 21/12+63/10 21/36+21/10 21/12+21/30 21/60+21/10 21/12+21/50 21/84+21/10 21/12+21/70