Add 30/21 and 12/18
1st number: 1 9/21, 2nd number: 12/18
30/21 + 12/18 is 44/21.
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,
30/21 = 30 × 6/21 × 6 = 180/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
12/18 = 12 × 7/18 × 7 = 84/126 - Add the two like fractions:
180/126 + 84/126 = 180 + 84/126 = 264/126 - 264/126 simplified gives 44/21
- So, 30/21 + 12/18 = 44/21
In mixed form: 22/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/21+12/18 30/21+24/18 30/42+12/18 30/21+12/36 90/21+12/18 30/21+36/18 30/63+12/18 30/21+12/54 30/21+60/18 30/21+12/90 30/21+84/18