Add 21/12 and 42/5
1st number: 1 9/12, 2nd number: 8 2/5
21/12 + 42/5 is 203/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 5 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 5 × 12 = 60,
42/5 = 42 × 12/5 × 12 = 504/60 - Add the two like fractions:
105/60 + 504/60 = 105 + 504/60 = 609/60 - 609/60 simplified gives 203/20
- So, 21/12 + 42/5 = 203/20
In mixed form: 103/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/12+42/5 21/12+84/5 21/24+42/5 21/12+42/10 63/12+42/5 21/36+42/5 21/12+42/15 21/60+42/5 21/12+42/25 21/84+42/5 21/12+42/35