# Math, Numbers & Tez

LIGO offers three built-in numerical types: `int`

, `nat`

and `tez`

.

## Addition

Addition in ligo is acomplished by using the `+`

operator. Some type constraints apply; for example you can't add `tez + nat`

.

In the following example you can find a series of arithmetic operations, including various numerical types. However, some bits of the example won't compile because adding an `int`

to a `nat`

produces an `int`

, not a `nat`

. Similiar rules apply for `tez`

:

`// int + int produces int`

const a: int = 5 + 10;

// nat + int produces int

const b: int = 5n + 10;

// tez + tez produces tez

const c: tez = 5mutez + 10mutez;

// you can't add tez + int or tez + nat, this won't compile

// const d: tez = 5mutez + 10n;

// two nats produce a nat

const e: nat = 5n + 10n;

// nat + int produces an int, this won't compile

// const f: nat = 5n + 10;

const g: int = 1_000_000;

Pro tip: you can use underscores for readability when defining large numbers

`const g: int = 1_000_000;`

`// int + int produces int`

let a: int = 5 + 10

// nat + int produces int

let b: int = 5n + 10

// tez + tez produces tez

let c: tez = 5mutez + 10mutez

// you can't add tez + int or tez + nat, this won't compile

// const d: tez = 5mutez + 10n

// two nats produce a nat

let e: nat = 5n + 10n

// nat + int produces an int, this won't compile

// const f: nat = 5n + 10

let g: int = 1_000_000

Pro tip: you can use underscores for readability when defining large numbers

`let g: int = 1_000_000;`

## Subtraction

The simpliest substraction looks like this:

⚠️ Even when subtracting two

`nats`

, the result is an`int`

`const a: int = 5 - 10;`

// substraction of two nats, yields an int

const b: int = 5n - 2n;

// won't compile, result is an int, not a nat

// const c: nat = 5n - 2n;

const d: tez = 5mutez - 1mt;

`let a: int = 5 - 10`

// substraction of two nats, yields an int

let b: int = 5n - 2n

// won't compile, result is an int, not a nat

// const c: nat = 5n - 2n

let d: tez = 5mutez - 1mt

## Multiplication

You can multiply values of the same type, such as:

`const a: int = 5 * 5;`

const b: nat = 5n * 5n;

// you can also multiply `nat` and `tez`

const c: tez = 5n * 5mutez;

`let a: int = 5 * 5`

let b: nat = 5n * 5n

// you can also multiply `nat` and `tez`

let c: tez = 5n * 5mutez

## Division

In LIGO you can divide `int`

, `nat`

, and `tez`

. Here's how:

⚠️ Division of two

`tez`

values results into a`nat`

`const a: int = 10 / 3;`

const b: nat = 10n / 3n;

const c: nat = 10mutez / 3mutez;

`let a: int = 10 / 3`

let b: nat = 10n / 3n

let c: nat = 10mutez / 3mutez

`int`

to `nat`

and back

From You can *cast* an `int`

to a `nat`

and vice versa, here's how:

`const a: int = int(1n);`

const b: nat = abs(1);