Math object

Math.round();

var x = 99.9; 
var y = Math.round(x); //100

Math.max();

var a = 100, b = 50, c = 88;   
var biggest = Math.max(a,b,c); //100

Math.min();

var a = 100, b = 50, c = 88;   
var smallest = Math.min(a,b,c); //50

Math.PI;

Math.PI; //3.141592653589793