Add 21/54 and 18/90
21/54 + 18/90 is 53/90.
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,
21/54 = 21 × 5/54 × 5 = 105/270 - Likewise, for the 2nd fraction, since 90 × 3 = 270,
18/90 = 18 × 3/90 × 3 = 54/270 - Add the two like fractions:
105/270 + 54/270 = 105 + 54/270 = 159/270 - 159/270 simplified gives 53/90
- So, 21/54 + 18/90 = 53/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/54+18/90 21/54+36/90 63/54+18/90 21/54+54/90