Suppose you have two variables, x and y, with the values 3 and 4, respectively. What should we do on the console to store the values on the variables?

Yes, we do the following:

var x = 3; // 3 is stored on variable x
var y = 4; // 4 is stored on variable y

Then, press Enter.

Take another variable that will hold the summation of x and y, as follows:

var z = x+y; // This syntax stores the sum of x and y on z

Can you tell me what will happen when we print z?

document.write(z);

Yes, you are correct, this will print 7, as shown in the following screenshot:

To subtract a number from another, you need to put a minus sign (-) between them.

Let's consider the following example:

var x = 9; // 9 is assigned to the variable x.
var y = 3; // 3 is assigned to the variable y.
var z = x - y ; // This syntax subtracts y from x and stores on z.
document.write(z); // Prints the value of z.

The output of this code is 6, as shown in the following screenshot:

To multiply two numbers or variables that have integer or float type of data stored on them, you just put an asterisk (*) between the variables or numbers.

Let's take a look at the following example:

var x = 6; // 6 is assigned to the variable x.
var y = 2; // 2 is assigned to the variable y.
var z = x * y; // For two numbers you can type z = 6 * 2 ;
document.write(z); // Prints the value of z

The output of this code is 12, as shown in the following screenshot:

To divide a number with another, you need to put a forward slash (/) between the numbers.

Let's take a look at the following example:

var x = 14; // assigns 14 on variable x.
var y = 2; // assigns 2 on variable y. 
var z = x / y; // divides x with y and stores the value on z. 
document.write(z); // prints the value of z. 

The output of this code is 7, as shown in the following screenshot:

If you want to find the modulus of a number with another, you need to put a percentage sign (%) between the numbers.

Let's consider the following example:

var x = 34; // assigns 34 on the variable x. 
var y = 3; // assigns 3 on the variable y. 
var z = x % y ; // divides x with y and returns the reminder and stores on the variable z
document.write(z);

The output of this code is 1, as shown in the following screenshot:

Now, let's summarize all the arithmetic operators that we learned so far in one single code.

Can you tell me the output of the following lines?

var x = 5 ;
var y = 4 ;
var sum = x + y ;
var sub = x - y ;
var mul = x * y ;
var div = x / y ;
var mod = x % y ;
document.write("The summation of x and y is "+ sum + "<br>") ;
document.write("The subtraction of x and y is " + sub + "<br>") ;
document.write("The multiplication of x and y is " + mul + "<br>");
document.write("The division of x and y is " + div + "<br>") ;
document.write("The modulus of x and y is " + mod + "<br>") ;

You will get the following output:

The summation of x and y is 9

The subtraction of x and y is 1

The multiplication of x and y is 20

The division of x and y is 1.25

The modulus of x and y is 1

This output can be seen in the following screenshot:

I guess you nailed it. Now, let's explain them in the following:

Consider the following example:

John has 56 pens. He wants to arrange them in seven rows. Each line will have an equal number of pens. Write a code that will print the number of pens in each row.

(Hint: take two variables for the number of pens and number of rows, divide the number of pens with the number of rows and store the value in a new variable.)

The sample output is as follows:

John will have to place XX pens on each line. // XX is the number of pens