# Numbers/Rounding and estimating

Notice: Incomplete

## Estimating[edit | edit source]

## Rounding[edit | edit source]

There are two main types of rounding, directed rounding and rounding to the nearest integer.

### Directed Rounding[edit | edit source]

Directed rounding is when one rounds all numbers in the same direction. There are four types, rounding up, rounding down, rounding towards zero and rounding away from zero.

#### Rounding Up[edit | edit source]

To round up, you round all numbers to the integer after it.

Examples:

-1.7 rounds to -1

-1.3 rounds to -1

1.3 rounds to 2

1.7 rounds to 1

#### Rounding Down[edit | edit source]

To round down, you round all numbers to the integer before it.

Examples:

-1.7 rounds to -2

-1.3 rounds to -2

1.3 rounds to 1

1.7 rounds to 1

#### Rounding Towards Zero[edit | edit source]

To round towards zero, you round all numbers to the nearest integer that is closer to zero.

Examples:

-1.7 rounds to -1

-1.3 rounds to -1

1.3 rounds to 1

1.7 rounds to 1

#### Rounding Away From Zero[edit | edit source]

To round away from zero, you round all numbers to the nearest integer that is further from zero.

Examples:

-1.7 rounds to -2

-1.3 rounds to -2

1.3 rounds to 2

1.7 rounds to 2

### Rounding To the Nearest Integer[edit | edit source]

Rounding to the nearest integer is self-explanatory. The problem is that some numbers don't have a 'nearest integer', notably, the numbers that are halfway between integers.