Question

I need to know how to do it

Answer 1

Convert them into improper fractions and then get a common denominator.

18 1/9 = 163/9
13 5/6 = 83/6

The least common multiple between 9 and 6 is 18.

163/9 x 2 = 326/18
83/6 x 2 = 249 / 18

Now subtract 326 from 249.

$326 - 249 = 77$

77/18 simplified is 4 5/18.

Answer 2

All you have to do is subtract those two number by turning the fractions into decimals