Add 21/12 and 80/20
1st number: 1 9/12, 2nd number: 4 0/20
21/12 + 80/20 is 23/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 20 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 20 × 3 = 60,
80/20 = 80 × 3/20 × 3 = 240/60 - Add the two like fractions:
105/60 + 240/60 = 105 + 240/60 = 345/60 - 345/60 simplified gives 23/4
- So, 21/12 + 80/20 = 23/4
In mixed form: 53/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/12+80/20 21/24+80/20 21/12+80/40 63/12+80/20 21/36+80/20 21/12+80/60 21/60+80/20 21/84+80/20