Question - What's Math Constants and Functions using JavaScript? 
          
        
        Answer - 
        The Math object contains useful constants such as Math.PI, Math.E 
Math also has a zillion helpful functions. 
Math.abs(value); //absolute value 
Math.max(value1, value2); //find the largest 
Math.random() //generate a decimal number between 0 and 1 
Math.floor(Math.random()*101) //generate a decimal number between 0 and 100