Add 9/30 and 21/90
9/30 + 21/90 is 8/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 30 × 3 = 90,
9/30 = 9 × 3/30 × 3 = 27/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
21/90 = 21 × 1/90 × 1 = 21/90 - Add the two like fractions:
27/90 + 21/90 = 27 + 21/90 = 48/90 - 48/90 simplified gives 8/15
- So, 9/30 + 21/90 = 8/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/30+21/90 9/30+42/90 9/60+21/90 27/30+21/90 9/30+63/90 9/90+21/90 45/30+21/90 63/30+21/90