Add 21/90 and 7/30
21/90 + 7/30 is 7/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 30 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 30 × 3 = 90,
7/30 = 7 × 3/30 × 3 = 21/90 - Add the two like fractions:
21/90 + 21/90 = 21 + 21/90 = 42/90 - 42/90 simplified gives 7/15
- So, 21/90 + 7/30 = 7/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/90+7/30 21/90+14/30 21/90+7/60 63/90+7/30 21/90+21/30 21/90+7/90 21/90+35/30 21/90+49/30