Add 12/45 and 28/20
1st number: 12/45, 2nd number: 1 8/20
12/45 + 28/20 is 5/3.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 45 × 4 = 180,
12/45 = 12 × 4/45 × 4 = 48/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
28/20 = 28 × 9/20 × 9 = 252/180 - Add the two like fractions:
48/180 + 252/180 = 48 + 252/180 = 300/180 - 300/180 simplified gives 5/3
- So, 12/45 + 28/20 = 5/3
In mixed form: 12/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/45+28/20 12/45+56/20 12/90+28/20 12/45+28/40 36/45+28/20 12/45+84/20 12/45+28/60 60/45+28/20 84/45+28/20