Add 21/90 and 6/9
21/90 + 6/9 is 9/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 9 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 9 × 10 = 90,
6/9 = 6 × 10/9 × 10 = 60/90 - Add the two like fractions:
21/90 + 60/90 = 21 + 60/90 = 81/90 - 81/90 simplified gives 9/10
- So, 21/90 + 6/9 = 9/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/90+6/9 21/90+12/9 21/90+6/18 63/90+6/9 21/90+18/9 21/90+6/27 21/90+30/9 21/90+6/45 21/90+42/9 21/90+6/63