Add 21/28 and 3/7
21/28 + 3/7 is 33/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 7 is 28
Next, find the equivalent fraction of both fractional numbers with denominator 28 - For the 1st fraction, since 28 × 1 = 28,
21/28 = 21 × 1/28 × 1 = 21/28 - Likewise, for the 2nd fraction, since 7 × 4 = 28,
3/7 = 3 × 4/7 × 4 = 12/28 - Add the two like fractions:
21/28 + 12/28 = 21 + 12/28 = 33/28 - So, 21/28 + 3/7 = 33/28
In mixed form: 15/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28+3/7 21/28+6/7 21/56+3/7 21/28+3/14 63/28+3/7 21/28+9/7 21/84+3/7 21/28+3/21 21/28+15/7 21/28+3/35 21/28+21/7 21/28+3/49