Round to a certain number of places

For rounding decimals you can use the built-in JavaScript methods toFixed or toPrecision.

var num = 10;
var result = num.toFixed(2); // result will equal 10.00
 
num = 930.9805;
result = num.toFixed(3); // result will equal 930.981
 
num = 500.2349;
result = num.toPrecision(4); // result will equal 500.2
 
num = 5000.2349;
result = num.toPrecision(4); // result will equal 5000
 
num = 555.55;
result = num.toPrecision(2); // result will equal 5.6e+2