Add 84/21 and 30/18
1st number: 4 0/21, 2nd number: 1 12/18
84/21 + 30/18 is 17/3.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 21 × 6 = 126,
84/21 = 84 × 6/21 × 6 = 504/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
30/18 = 30 × 7/18 × 7 = 210/126 - Add the two like fractions:
504/126 + 210/126 = 504 + 210/126 = 714/126 - 714/126 simplified gives 17/3
- So, 84/21 + 30/18 = 17/3
In mixed form: 52/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/21+60/18 84/42+30/18 84/21+30/36 84/21+90/18 84/63+30/18 84/21+30/54 84/21+30/90