Add 12/28 and 6/21
12/28 + 6/21 is 5/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 28 × 3 = 84,
12/28 = 12 × 3/28 × 3 = 36/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
6/21 = 6 × 4/21 × 4 = 24/84 - Add the two like fractions:
36/84 + 24/84 = 36 + 24/84 = 60/84 - 60/84 simplified gives 5/7
- So, 12/28 + 6/21 = 5/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/28+6/21 12/28+12/21 12/56+6/21 12/28+6/42 36/28+6/21 12/28+18/21 12/84+6/21 12/28+6/63 60/28+6/21 12/28+30/21 84/28+6/21 12/28+42/21