Add 8/12 and 30/21
1st number: 8/12, 2nd number: 1 9/21
8/12 + 30/21 is 44/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
8/12 = 8 × 7/12 × 7 = 56/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
30/21 = 30 × 4/21 × 4 = 120/84 - Add the two like fractions:
56/84 + 120/84 = 56 + 120/84 = 176/84 - 176/84 simplified gives 44/21
- So, 8/12 + 30/21 = 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: 16/12+30/21 8/12+60/21 8/24+30/21 8/12+30/42 24/12+30/21 8/12+90/21 8/36+30/21 8/12+30/63 40/12+30/21 8/60+30/21 56/12+30/21 8/84+30/21