Operator

Meaning

Description

+

Add

Add together to things; you can add strings and numbers together.  So:

1 + 1 = 2

“Hello ” + “world” = “Hello world”

“I have “ + 2 + “ apples” = “I have 2 apples”

-

Subtraction

Subtract one number from another.

(Note that this operator does not work with strings)

So:

10 – 2        evaluates to 8

*

Multiplication

Multiplies two numbers together.

(Note that this operator does not work with strings)

So:

10 * 2        evaluates to 20

Multiplication has a higher precedence than addition or subtraction, so:

3 + 2 * 10        evaluates to 23

as you would probably expect if you can remember what Mrs. Button said in your grade 6 math class.

/

Division

Divides one number into another.

(Note that this operator does not work with strings)

So:

10 / 2        evaluates to 5

Like multiplication, division has a higher precedence than addition or subtraction, so:

6 + 10 / 2        evaluates to 11

If you guess this as well then picture Mrs. Button giving you a star sticker.

( )

Grouping

You can use parenthesis to group expressions together and override the standard operator precedence.

So:

(6 + 10) / 2 evaluates to 8