Add 30/84 and 9/21
30/84 + 9/21 is 11/14.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 84 × 1 = 84,
30/84 = 30 × 1/84 × 1 = 30/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
9/21 = 9 × 4/21 × 4 = 36/84 - Add the two like fractions:
30/84 + 36/84 = 30 + 36/84 = 66/84 - 66/84 simplified gives 11/14
- So, 30/84 + 9/21 = 11/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/84+9/21 30/84+18/21 30/84+9/42 90/84+9/21 30/84+27/21 30/84+9/63 30/84+45/21 30/84+63/21