Add 3/21 and 9/30
3/21 + 9/30 is 31/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
3/21 = 3 × 10/21 × 10 = 30/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
9/30 = 9 × 7/30 × 7 = 63/210 - Add the two like fractions:
30/210 + 63/210 = 30 + 63/210 = 93/210 - 93/210 simplified gives 31/70
- So, 3/21 + 9/30 = 31/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/21+9/30 3/21+18/30 3/42+9/30 3/21+9/60 9/21+9/30 3/21+27/30 3/63+9/30 3/21+9/90 15/21+9/30 3/21+45/30 3/21+63/30