The Round function return a value towards the nearest integer.

Syntax:-

Math.round(number)

number is any numeric expression.

If the fractional portion of number is .5 or greater, the argument is rounded to the next highest integer. If the fractional portion of number is less than .5, the argument is rounded to the next lowest integer.

For example:

1. Math.round(25.9) //returns 26
2. Math.round(25.2) //returns 25
3. Math.round(-2.58) //returns -3

If you want to display $25 in standard currency format below is the examples:

var original = 28.453;

1) //round "original" to two decimals
var result = Math.round(original*100)/100  //returns 28.45


2) // round "original" to 1 decimal
var result = Math.round(original*10)/10  //returns 28.5


3) //round 8.111111 to 3 decimals
var result = Math.round(8.111111*1000)/1000  //returns 8.111

In case you haven't understanding it, the formula to round any number to x decimal points is:

1) Multiple the original number by 10^x (10 to the power of x)
2) Apply Math.round() to the result
3) Divide result by 10^x