Add 20/80 and 28/12
1st number: 20/80, 2nd number: 2 4/12
20/80 + 28/12 is 31/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 12 is 240
Next, find the equivalent fraction of both fractional numbers with denominator 240 - For the 1st fraction, since 80 × 3 = 240,
20/80 = 20 × 3/80 × 3 = 60/240 - Likewise, for the 2nd fraction, since 12 × 20 = 240,
28/12 = 28 × 20/12 × 20 = 560/240 - Add the two like fractions:
60/240 + 560/240 = 60 + 560/240 = 620/240 - 620/240 simplified gives 31/12
- So, 20/80 + 28/12 = 31/12
In mixed form: 27/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/80+28/12 20/80+56/12 20/80+28/24 60/80+28/12 20/80+84/12 20/80+28/36 20/80+28/60 20/80+28/84