Add 18/28 and 45/90
18/28 + 45/90 is 8/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 90 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 28 × 45 = 1260,
18/28 = 18 × 45/28 × 45 = 810/1260 - Likewise, for the 2nd fraction, since 90 × 14 = 1260,
45/90 = 45 × 14/90 × 14 = 630/1260 - Add the two like fractions:
810/1260 + 630/1260 = 810 + 630/1260 = 1440/1260 - 1440/1260 simplified gives 8/7
- So, 18/28 + 45/90 = 8/7
In mixed form: 11/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/28+45/90 18/56+45/90 54/28+45/90 18/84+45/90 90/28+45/90