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
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