In Javascript , you can do **operations** on numbers to help you do **calculations** and make things easier.

# Basic operations on numbers

- Addition : using " + " operator

`var sum ;`

sum = 10 + 5 ;

console.log(sum); // output : 15

- Subtraction : using " - " operator

`var difference ;`

difference = 22 - 10 ;

console.log(difference); // output : 12

- Division : using " / " operator

`var quotient ;`

quotient = 50 / 5 ;

console.log(quotient); // output : 10

- Multiplication : using " * " operator

`var product ;`

product = 7 * 2;

console.log(product); // output : 14

- Getting remainder of division : using " % " operator

`var remainder ;`

remainder = 10 % 4;

console.log(remainder); // output : 2

- Raising a number to a power : using the " ** " operator

`var num = 3;`

squaredNum = num ** 2;

console.log(squaredNum) // output : 9

# Augmented operations on numbers

Sometimes , you want to**update**a variable storing a

**numeric value**by doing any of the operations (like : adding to it , subtraction from it , dividing or multiplying it by something).class="javascript">But you don't have to use the long form like the following one.

`var num = 2 ;`

// adding 3 to the value of num and assigning this value (5) to the variable num

num = num + 3 ;

You can shorten it to be as the following example`var num = 2;`

// adding 3 to the value of num and assigning this value (5) to the variable num

num += 3 ;

In the previous example , we used the plus equals operator " += "

which does the same thing as the code example before it.

This can be used in the operations (+, -, *, /).*

`var num = 20 ;`

// examples of augmented operations that can be done

num += 2 ;

num -= 3 ;

num *= 5 ;

num /= 11 ;

You can replace the value you use to **update** your variable by another **variable** as in the following example

`var salary = 1500;`

var bonus = 250;

console.log(salary); // output : 1500

salary += bonus;

console.log(salary); // output : 1750

Another example`var maxTemperature = 32;`

var minTemperature = 24;

var averageTemperature = ( maxTemperature + minTemperature ) / 2 ;

console.log(averageTemperature); // output : 28

# Incrementing and decrementing by one

Sometimes you want to update variables by incrementing or decrementing them by one, instead of using (num += 1 or num -= 1) , you can use a shorter way using " ++ " and " -- " operators./p>

`var num = 6;`

num++; // increases it by one to be 7

num--; // decreases it by one to be 6 again

# Order of operations

If you have a more **complex calculation** you have to know what is calculated first , the **order of operations** that the computer follows is the same as the one you studied in your math's classes, which is **PEDMAS **(from left to right) :

arenthesis (Brackets)__P__xponents ( powers )__E__ivision and**D**ultiplication**M**ddition and__A__ubtraction**S**

Some people make it funnier and easier to remember by saying it like : "

**lease**

__p__**xcuse**

__e__**y**

__m____ear__

**d**__unt__

**a**__ally ! "__

**S****Example**: in ( 2 * (4 + 6) * 2 / 5 - 1) :

**first**( 4 + 6 ) is calculated to be 10 ,**then**it's raised to the second power to be 100 ,**then**it's multiplied by 2 to be 200 ,**after that,**it's divided by 5 to be 40 ,**and finally,**1 is subtracted from it to be 39.

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