Add 21/28 and 6/8
21/28 + 6/8 is 3/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 8 is 56
Next, find the equivalent fraction of both fractional numbers with denominator 56 - For the 1st fraction, since 28 × 2 = 56,
21/28 = 21 × 2/28 × 2 = 42/56 - Likewise, for the 2nd fraction, since 8 × 7 = 56,
6/8 = 6 × 7/8 × 7 = 42/56 - Add the two like fractions:
42/56 + 42/56 = 42 + 42/56 = 84/56 - 84/56 simplified gives 3/2
- So, 21/28 + 6/8 = 3/2
In mixed form: 11/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28+6/8 21/28+12/8 21/56+6/8 21/28+6/16 63/28+6/8 21/28+18/8 21/84+6/8 21/28+6/24 21/28+30/8 21/28+6/40 21/28+42/8 21/28+6/56