Add 28/4 and 7/21, Solve 7 0/4 + 7/21 as a fraction

Add 28/4 and 7/21

1^st number: 7 0/4, 2^nd number: 7/21

28/4 + 7/21 is 22/3.

Find the least common denominator or LCM of the two denominators:
LCM of 4 and 21 is 84

Next, find the equivalent fraction of both fractional numbers with denominator 84
For the 1st fraction, since 4 × 21 = 84,
28/4 = 28 × 21/4 × 21 = 588/84
Likewise, for the 2nd fraction, since 21 × 4 = 84,
7/21 = 7 × 4/21 × 4 = 28/84
Add the two like fractions:
588/84 + 28/84 = 588 + 28/84 = 616/84
616/84 simplified gives 22/3
So, 28/4 + 7/21 = 22/3
In mixed form: 71/3

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad