Add 27/80 and 42/18, Solve 27/80 + 2 6/18 as a fraction

Add 27/80 and 42/18

1^st number: 27/80, 2^nd number: 2 6/18

27/80 + 42/18 is 641/240.

Find the least common denominator or LCM of the two denominators:
LCM of 80 and 18 is 720

Next, find the equivalent fraction of both fractional numbers with denominator 720
For the 1st fraction, since 80 × 9 = 720,
27/80 = 27 × 9/80 × 9 = 243/720
Likewise, for the 2nd fraction, since 18 × 40 = 720,
42/18 = 42 × 40/18 × 40 = 1680/720
Add the two like fractions:
243/720 + 1680/720 = 243 + 1680/720 = 1923/720
1923/720 simplified gives 641/240
So, 27/80 + 42/18 = 641/240
In mixed form: 2161/240

MathStep (Works offline)

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