Add 27/80 and 72/20, Solve 27/80 + 3 12/20 as a fraction

Add 27/80 and 72/20

1^st number: 27/80, 2^nd number: 3 12/20

27/80 + 72/20 is 63/16.

Find the least common denominator or LCM of the two denominators:
LCM of 80 and 20 is 80

Next, find the equivalent fraction of both fractional numbers with denominator 80
For the 1st fraction, since 80 × 1 = 80,
27/80 = 27 × 1/80 × 1 = 27/80
Likewise, for the 2nd fraction, since 20 × 4 = 80,
72/20 = 72 × 4/20 × 4 = 288/80
Add the two like fractions:
27/80 + 288/80 = 27 + 288/80 = 315/80
315/80 simplified gives 63/16
So, 27/80 + 72/20 = 63/16
In mixed form: 315/16

MathStep (Works offline)

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