Add 7/18 and 42/90
7/18 + 42/90 is 77/90.
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,
7/18 = 7 × 5/18 × 5 = 35/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
42/90 = 42 × 1/90 × 1 = 42/90 - Add the two like fractions:
35/90 + 42/90 = 35 + 42/90 = 77/90 - So, 7/18 + 42/90 = 77/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/18+42/90 7/18+84/90 7/36+42/90 21/18+42/90 7/54+42/90 35/18+42/90 7/90+42/90 49/18+42/90