Add 18/45 and 9/12
18/45 + 9/12 is 23/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 12 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 12 × 15 = 180,
9/12 = 9 × 15/12 × 15 = 135/180 - Add the two like fractions:
72/180 + 135/180 = 72 + 135/180 = 207/180 - 207/180 simplified gives 23/20
- So, 18/45 + 9/12 = 23/20
In mixed form: 13/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/45+9/12 18/45+18/12 18/90+9/12 18/45+9/24 54/45+9/12 18/45+27/12 18/45+9/36 90/45+9/12 18/45+45/12 18/45+9/60 18/45+63/12 18/45+9/84