Add 21/12 and 18/5
1st number: 1 9/12, 2nd number: 3 3/5
21/12 + 18/5 is 107/20.
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,
18/5 = 18 × 12/5 × 12 = 216/60 - Add the two like fractions:
105/60 + 216/60 = 105 + 216/60 = 321/60 - 321/60 simplified gives 107/20
- So, 21/12 + 18/5 = 107/20
In mixed form: 57/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/12+18/5 21/12+36/5 21/24+18/5 21/12+18/10 63/12+18/5 21/12+54/5 21/36+18/5 21/12+18/15 21/12+90/5 21/60+18/5 21/12+18/25 21/84+18/5 21/12+18/35