Add 10/18 and 21/90
10/18 + 21/90 is 71/90.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 18 × 5 = 90,
10/18 = 10 × 5/18 × 5 = 50/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
21/90 = 21 × 1/90 × 1 = 21/90 - Add the two like fractions:
50/90 + 21/90 = 50 + 21/90 = 71/90 - So, 10/18 + 21/90 = 71/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/18+21/90 10/18+42/90 10/36+21/90 30/18+21/90 10/18+63/90 10/54+21/90 50/18+21/90 10/90+21/90 70/18+21/90