Casting becomes more important when we're doing math problems because Java's got two ways of doing division:

- Floating point division
- Integer division

## Floating point division

Floating point division is the division you know:

```
3.0/4 // = 0.75
5/4.0 // = 1.25
1.0/4 // = 0.25
```

## Integer division

Integer division is a special kind of division that computers can do. In integer division, all answers are integers (whole numbers), and any decimals are dropped.

```
3/4 // = 0
5/4 // = 1
1/4 // = 0
```

## Using each

Integer division happens when all the numbers being divided are integers. Floating point division's used when at least one number's a double.

You can also force floating point division with casts. Just keep in mind the order of operations!

```
(double) 3/4 // = 0.75
(double) 5/4 // = 1
(double) (1/4) // = 0.0 because integer division came before the cast
```