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Welcome to this tutorial on basic arithmetic operators.

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I'll first go through plus, minus, multiply and divide operations.

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These are written as p lus, minus, multiply as an asterisk and divide as a forward slash.

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So, I will have 2 variables.

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I'll create a variable called "num1" and I'll save that as value equal to "10" and "num2" is equal to "2".

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So, these are both integer numbers with no decimal point.

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Okay, now, say I want to add "num1" and "num2" together.

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So I echo out the answer of "num1" added to "num2".

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Let's test it out.

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So, that's "12".  10 and 2, num1 and num2, when 10 and 2 are added, the answer is "12".

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Okay now let's try minus. We will just replace the minus symbol there.

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Refresh and that will be "8".

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Now lets try multiplication.  10 times 2 is 20 and we've got "20".

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Next, 10 divided by 2 is just half of 10 which is "5".

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Now, what we can do is we can add something on the end of this.

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So, let's say this is divided by num2.

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So, what I think this operation will do is, it will add "num1" and "num2", so that is 10 and 2 which will give us 12 and then 12 divided by 2.

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So, 12 divided by 2 should give 6.

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But actually what this does is it takes num2 and divides it by num2 which will give 1 and add num1 to that.

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So, that means, instead of 6 we will get 11.

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Now, the reason for this is that division operator will always work before addition operator.  The same with multiply

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Now, to solve this, we should put brackets.

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The brackets will say - we'll take this operation first, do whatever is in here and then continue to divide by whatever this could be an integer or a variable.

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So, here what it will do is num1 plus num2 which is 10 plus 2 which gives us 12 divided by 2 which should give us 6.

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Let's refresh that and we can see that it worked!

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So, these are the basic arithmetic operators which are simple to use.

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If you come across any problems, always  verify your calculations with a calculator to make sure they're working.

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We'll see a few more of these soon.

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We'll learn about the increment arithmetic operator which increments by 1 but I'll use that a little later.

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So, practice these and make sure you learn them well.

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Thanks for watching.  This is Arvind dubbing for the Spoken Tutorial project.