Add 30/21 and 7/12
1st number: 1 9/21, 2nd number: 7/12
30/21 + 7/12 is 169/84.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 12 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
30/21 = 30 × 4/21 × 4 = 120/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
7/12 = 7 × 7/12 × 7 = 49/84 - Add the two like fractions:
120/84 + 49/84 = 120 + 49/84 = 169/84 - So, 30/21 + 7/12 = 169/84
In mixed form: 21/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/21+7/12 30/21+14/12 30/42+7/12 30/21+7/24 90/21+7/12 30/21+21/12 30/63+7/12 30/21+7/36 30/21+35/12 30/21+7/60 30/21+49/12 30/21+7/84