Add 18/80 and 27/7, Solve 18/80 + 3 6/7 as a fraction

Add 18/80 and 27/7

1^st number: 18/80, 2^nd number: 3 6/7

18/80 + 27/7 is 1143/280.

Find the least common denominator or LCM of the two denominators:
LCM of 80 and 7 is 560

Next, find the equivalent fraction of both fractional numbers with denominator 560
For the 1st fraction, since 80 × 7 = 560,
18/80 = 18 × 7/80 × 7 = 126/560
Likewise, for the 2nd fraction, since 7 × 80 = 560,
27/7 = 27 × 80/7 × 80 = 2160/560
Add the two like fractions:
126/560 + 2160/560 = 126 + 2160/560 = 2286/560
2286/560 simplified gives 1143/280
So, 18/80 + 27/7 = 1143/280
In mixed form: 423/280

MathStep (Works offline)

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