Add 12/18 and 9/45
12/18 + 9/45 is 13/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 45 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 18 × 5 = 90,
12/18 = 12 × 5/18 × 5 = 60/90 - Likewise, for the 2nd fraction, since 45 × 2 = 90,
9/45 = 9 × 2/45 × 2 = 18/90 - Add the two like fractions:
60/90 + 18/90 = 60 + 18/90 = 78/90 - 78/90 simplified gives 13/15
- So, 12/18 + 9/45 = 13/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/18+9/45 12/18+18/45 12/36+9/45 12/18+9/90 36/18+9/45 12/18+27/45 12/54+9/45 60/18+9/45 12/90+9/45 84/18+9/45 12/18+63/45