how to round a number to a specified number of decimals in JavaScript (w3schools) code example

Example 1: math.round js 1 decimal

var number = 12.3456789;
var rounded = Math.round( number * 10 ) / 10;
// rounded is 12.3

Example 2: javascript round to 7 decimal places

myNumber.toFixed(7);

Example 3: round decimal js

Math.round(num * 100) / 100