Attach values to variables and add them together:

```
<!DOCTYPE html>
<html>
<body>
<script>
var a = 10;
var b = 20;
document.write(a+b);
document.write(a*b);
</script>
</body>
</html>
```

**Output:**

30 200 |

**(=) assign** is called the assignment operator

**(+)** assign is called the addition operator

**(*)** assign is called the multiplication operator

### JavaScript Arithmetic Operators

Operator | Description |
---|---|

+ |
Addition |

- |
Subtraction |

* |
Multiplication |

** |
Exponentiation |

/ |
Division |

% |
Modulus (Division Remainder) |

++ |
Increment |

-- |
Decrement |

JavaScript String Operators

The + operator can additionally be used to add (concatenate) strings.

```
<!DOCTYPE html>
<html>
<body>
<script>
var txt1 = "Rathoji";
var txt2 = "Tutorial";
var txt3 = txt1 + " " + txt2;
document.write(txt3);
</script>
</body>
</html>
```**
**

**Output:**

Rathorji Tutorial |