abs() : Returns the absolute value of a number

Example of abs() :
<script type="text/javascript">
var s;
var v1 = Math.abs(6);
var v2 = Math.abs(-6);
if (v1 == v2) {
document.write("Absolute values are the same.");
}
else {
document.write("Absolute values are different.");
}
</script>

ceil() : Returns the smallest integer greater than or equal to the number

Example of ceil() :
<script type="text/javascript">
var value = Math.ceil(45.95);
document.write("First Test Value : " + value ); 
  
var value = Math.ceil(45.20);
document.write("
Second Test Value : " + value ); 

var value = Math.ceil(-45.95);
document.write("
Third Test Value : " + value ); 

var value = Math.ceil(-45.20);
document.write("
Fourth Test Value : " + value ); 
</script>

floor() : Returns the largest integer less than or equal to a number

Example of floor() :
<script type="text/javascript">
var value = Math.floor(45.95);
document.write("First Test Value : " + value ); 
  
var value = Math.floor(45.20);
document.write("
Second Test Value : " + value ); 

var value = Math.floor(-45.95);
document.write("
Third Test Value : " + value ); 

var value = Math.floor(-45.20);
document.write("
Fourth Test Value : " + value ); 
</script>

max() : Returns the greater of two numbers

Example of max() :
<script type="text/javascript">
document.write(Math.max(0,150,30,20,38));
</script>

min() : Returns the lesser of two numbers

Example of min() :
<script type="text/javascript">
document.write(Math.min(0,150,30,20,38));
</script>

pow() : Returns base if the exponent power, that is baseexponent

Example of pow() :
<script type="text/javascript">
document.write(Math.pow(10,3));
</script>

random() : Returns a pseudo-random number between 0 and 1

Example of random() :
<script type="text/javascript">
document.write(Math.random());

//Get a random number between 1 and 6
document.write(Math.floor(Math.random() * 6) + 1);

//Get a random number between 1 and 10
document.write(Math.floor((Math.random()*10)+1);

</script>

round() : Returns the value of a number rounded to the nearest integer

Example of round() :
<script type="text/javascript">
document.write(Math.round(25.9)+"
");
document.write(Math.round(25.4)+"
");
document.write(Math.round(25.5)+"
");
document.write(Math.round(-2.58));
</script>

sqrt() : Returns the squareroot of a number

Example of sqrt() :
<script type="text/javascript">
document.write(Math.sqrt(16));
document.write(Math.sqrt(3));
</script>

Example1 :
                    <script type="text/javascript">
                                    var n = prompt("Please Enter a Number.");
                                    var n1 = parseInt(n);
                                    if (isNaN(n1)) {
                                        alert(n1);
                                    }
                                    var e = eval(2 + n1);
                                    alert(e);
                    </script>
Example2 :
                    <script type="text/javascript">
                                    r = 5;
                        theta = 60;
                        beta = 45;
                        with (Math) {
                        a = PI * r * r;
                        y = tan(theta);
                        x = r * cos(theta);
                        z = abs(beta);
                        alert(a + ":" +y+":"+x+":"+z);
                        }
                 is the functional equivalent of:
                        a = Math.PI * r * r;
                        y = Math.tan(theta);
                        x = r * Math.cos(theta);
                        z = Math.abs(beta);
                    </script>
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Output: