Add 18/54 and 21/90
18/54 + 21/90 is 17/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 54 and 90 is 270
Next, find the equivalent fraction of both fractional numbers with denominator 270 - For the 1st fraction, since 54 × 5 = 270,
18/54 = 18 × 5/54 × 5 = 90/270 - Likewise, for the 2nd fraction, since 90 × 3 = 270,
21/90 = 21 × 3/90 × 3 = 63/270 - Add the two like fractions:
90/270 + 63/270 = 90 + 63/270 = 153/270 - 153/270 simplified gives 17/30
- So, 18/54 + 21/90 = 17/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/54+21/90 18/54+42/90 18/54+63/90 90/54+21/90