Add 4/28 and 27/21, Solve 4/28 + 1 6/21 as a fraction

Add 4/28 and 27/21

1^st number: 4/28, 2^nd number: 1 6/21

4/28 + 27/21 is 10/7.

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,
4/28 = 4 × 3/28 × 3 = 12/84
Likewise, for the 2nd fraction, since 21 × 4 = 84,
27/21 = 27 × 4/21 × 4 = 108/84
Add the two like fractions:
12/84 + 108/84 = 12 + 108/84 = 120/84
120/84 simplified gives 10/7
So, 4/28 + 27/21 = 10/7
In mixed form: 13/7

MathStep (Works offline)

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