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Arithmetic operators are used to perform arithmetic on numbers.

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Both constants and variables.

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This chart provides a quick overview of the different operators that can be used.

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Now let's go over some examples to see how each one works.

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We'll begin by adding two numerical values

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in between our open and close script tags.

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We'll create a variable called X the value of x will be 100 plus 50

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next we'll create

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our get element by I.D.

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and the idea will be the word add that we'll go ahead and create the paragraph that will contain the

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output value.

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Let's go ahead and save our file and previewed in our web browser and we can see that we get the value

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one hundred and fifty which is the correct value.

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Now let's go ahead and perform another calculation this time we'll add two values and multiply the result

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by the value of another variable

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so let's go ahead and define two variables that variable a which will equal three variable B which will

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equal 20 plus 30 multiplied by a.

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So in this case it'll be multiplied by three

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now we'll just create our output and we'll call the I.D. add 2 and we'll display the result underneath

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our first calculation.

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Then we'll save the file and refresh our web browser

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so here we have once again one hundred and fifty output.

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So that would be 20 plus 30 which is 50 multiplied by three which equates to one hundred and fifty.

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This next example will subtract two values

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called a variable C and we'll do one hundred minus 50.

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And this time we'll give it the I.D. sub and we'll output the result at the bottom of our other two

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calculations

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and then we have it.

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So that's how we multiply add and subtract.