Add 27/24 and 20/21, Solve 1 3/24 + 20/21 as a fraction

Add 27/24 and 20/21

1^st number: 1 3/24, 2^nd number: 20/21

27/24 + 20/21 is 349/168.

Find the least common denominator or LCM of the two denominators:
LCM of 24 and 21 is 168

Next, find the equivalent fraction of both fractional numbers with denominator 168
For the 1st fraction, since 24 × 7 = 168,
27/24 = 27 × 7/24 × 7 = 189/168
Likewise, for the 2nd fraction, since 21 × 8 = 168,
20/21 = 20 × 8/21 × 8 = 160/168
Add the two like fractions:
189/168 + 160/168 = 189 + 160/168 = 349/168
So, 27/24 + 20/21 = 349/168
In mixed form: 213/168

MathStep (Works offline)

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