Add 15/45 and 15/20
15/45 + 15/20 is 13/12.
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,
15/45 = 15 × 4/45 × 4 = 60/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
15/20 = 15 × 9/20 × 9 = 135/180 - Add the two like fractions:
60/180 + 135/180 = 60 + 135/180 = 195/180 - 195/180 simplified gives 13/12
- So, 15/45 + 15/20 = 13/12
In mixed form: 11/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/45+15/20 15/45+30/20 15/90+15/20 15/45+15/40 15/45+45/20 15/45+15/60 75/45+15/20 15/45+75/20