Add 18/84 and 15/90
18/84 + 15/90 is 8/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 90 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 84 × 15 = 1260,
18/84 = 18 × 15/84 × 15 = 270/1260 - Likewise, for the 2nd fraction, since 90 × 14 = 1260,
15/90 = 15 × 14/90 × 14 = 210/1260 - Add the two like fractions:
270/1260 + 210/1260 = 270 + 210/1260 = 480/1260 - 480/1260 simplified gives 8/21
- So, 18/84 + 15/90 = 8/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/84+15/90 18/84+30/90 54/84+15/90 18/84+45/90 90/84+15/90 18/84+75/90