Add 18/45 and 12/90
18/45 + 12/90 is 8/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 45 × 2 = 90,
18/45 = 18 × 2/45 × 2 = 36/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
12/90 = 12 × 1/90 × 1 = 12/90 - Add the two like fractions:
36/90 + 12/90 = 36 + 12/90 = 48/90 - 48/90 simplified gives 8/15
- So, 18/45 + 12/90 = 8/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/45+12/90 18/45+24/90 18/90+12/90 54/45+12/90 18/45+36/90 90/45+12/90 18/45+60/90 18/45+84/90