Round a number down to the nearest integer

Simple example of rounding down a number to the nearest integer. 
<!DOCTYPE html>
<html>
<head>
</head>
<body>
    
    <div id="numberText"></div>
    
<script>
    
    var element = document.getElementById('numberText');
    
    var someRandomNumber;
    var floorNumber;
    
    function getRoundedDownRandomNumber(max) {
        
        someRandomNumber = Math.random() * max;
        floorNumber = Math.floor(someRandomNumber);
        
    }
    
    getRoundedDownRandomNumber(100); // get a rounded down random number from 0 to 100
    
    element.innerHTML = "The random number rounded down from " + someRandomNumber + " is " + floorNumber;
    
</script>
</body>
</html>
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