Add 12/21 and 84/30
1st number: 12/21, 2nd number: 2 24/30
12/21 + 84/30 is 118/35.
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,
12/21 = 12 × 10/21 × 10 = 120/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
84/30 = 84 × 7/30 × 7 = 588/210 - Add the two like fractions:
120/210 + 588/210 = 120 + 588/210 = 708/210 - 708/210 simplified gives 118/35
- So, 12/21 + 84/30 = 118/35
In mixed form: 313/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/21+84/30 12/42+84/30 12/21+84/60 36/21+84/30 12/63+84/30 12/21+84/90 60/21+84/30 84/21+84/30