round down to nearest 100 javascript code example

Example 1: javascript round to nearest 10

var rounded = Math.round(number / 10) * 10

Example 2: js nearest 100

Math.round(n / 100) * 100

Example 3: rounding to nearest hundredth js

Math.round(X);           // round X to an integer
Math.round(10*X)/10;     // round X to tenths
Math.round(100*X)/100;   // round X to hundredths
Math.round(1000*X)/1000; // round X to thousandths
...