Add 18/45 and 27/20
1st number: 18/45, 2nd number: 1 7/20
18/45 + 27/20 is 7/4.
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,
18/45 = 18 × 4/45 × 4 = 72/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
27/20 = 27 × 9/20 × 9 = 243/180 - Add the two like fractions:
72/180 + 243/180 = 72 + 243/180 = 315/180 - 315/180 simplified gives 7/4
- So, 18/45 + 27/20 = 7/4
In mixed form: 13/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/45+27/20 18/45+54/20 18/90+27/20 18/45+27/40 54/45+27/20 18/45+81/20 18/45+27/60 90/45+27/20