It is easy, you can even round numbers off to a certain number of decimal places.

JavaScript offers the following method: Math.round(x)

Math.round(295.9);     // returns 296
Math.round(245.2);     // returns 245
Math.round(-102.58);   // returns -103

Here is how you round to specific decimal numbers:

Use the Math.round() function along with the basic multiply and divide operators and you can easily round numbers to a specific decimal.

For example:

var pi = "3.1415926535";

// Round to tenths
pi = Math.round(pi*10)/10;      // returns 3.14

// Round to hundredths
pi = Math.round(pi*100)/100;    // returns 3.142

// Round to Bazillionths
pi = Math.round(pi*infinity)/infinity;   // Just Kidding


This function is very useful when rounding dollar amounts:

var totalDue = "1003.1415926535";

// Round to tenths:
totalDue = Math.round(totalDue*100)/100;   // returns $1003.14

If you have something that has been troubling you, just ask for help!