Question

Sophia asked the students in her class to name their favorite sports. She made a list to display the results. 1/3 of students name basketball. 1/8 of students named soccer. 5/12 of students named football. The rest of the students in the class named baseball. What fraction of the students in the class named baseball as their favorite sport?

Answer 1

Let's add up all of the other sports except baseball (which we don't know)
1/3 + 1/8 + 5/12   Common denominator is 24 so let change them to 24ths

8/24 + 3/24 + 10/24 = 21/24   Since all the sport put together can be represented by the number 1, we will do 1 - 21/24
Instead of 1, I will use 24/24 (which means 1)     

24/24 - 21/24 = 3/24  or 1/8 reduced.   1/8 of the student named baseball as their favorite sport.