In one fifth grade class 1/5 of the students wear glasses, and 1/4 wear contact lenses. What fraction of the class has corrected vision?

Explanation:

We add up the fractions given

1/5 + 1/4

4/20 + 5/20

(4+5)/20

9/20

An example:

Let's say there are 20 students.

Assume that those who wear glasses do not wear contacts, and vice versa. In other words, assume someone doesn't use both types.

If that assumption holds up, then 4+5 = 9 students wear corrected vision of some sort. So that's how we can arrive at the answer of 9/20 as the fraction of corrected vision students.

if the pizza is divided equally into 2 equal halves then you would get

πr^2/2

where r is the radius of the pizza.

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