Add 21/90 and 7/18
21/90 + 7/18 is 28/45.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 90 × 1 = 90,
21/90 = 21 × 1/90 × 1 = 21/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
7/18 = 7 × 5/18 × 5 = 35/90 - Add the two like fractions:
21/90 + 35/90 = 21 + 35/90 = 56/90 - 56/90 simplified gives 28/45
- So, 21/90 + 7/18 = 28/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/90+7/18 21/90+14/18 21/90+7/36 63/90+7/18 21/90+21/18 21/90+7/54 21/90+35/18 21/90+7/90 21/90+49/18