Add 21/28 and 28/7
1st number: 21/28, 2nd number: 4 0/7
21/28 + 28/7 is 19/4.
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,
28/7 = 28 × 4/7 × 4 = 112/28 - Add the two like fractions:
21/28 + 112/28 = 21 + 112/28 = 133/28 - 133/28 simplified gives 19/4
- So, 21/28 + 28/7 = 19/4
In mixed form: 43/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28+28/7 21/28+56/7 21/56+28/7 21/28+28/14 63/28+28/7 21/28+84/7 21/84+28/7 21/28+28/21 21/28+28/35 21/28+28/49