Add 8/12 and 28/21
1st number: 8/12, 2nd number: 1 7/21
8/12 + 28/21 is 2/1.
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,
28/21 = 28 × 4/21 × 4 = 112/84 - Add the two like fractions:
56/84 + 112/84 = 56 + 112/84 = 168/84 - 168/84 simplified gives 2/1
- So, 8/12 + 28/21 = 2/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/12+28/21 8/12+56/21 8/24+28/21 8/12+28/42 24/12+28/21 8/12+84/21 8/36+28/21 8/12+28/63 40/12+28/21 8/60+28/21 56/12+28/21 8/84+28/21