how to round to nearest tenth in javascript code example

Example 1: javascript round to nearest 10

var rounded = Math.round(number / 10) * 10

Example 2: rounding to nearest hundredth js

Math.round(X);           // round X to an integer
Math.round(10*X)/10;     // round X to tenths
Math.round(100*X)/100;   // round X to hundredths
Math.round(1000*X)/1000; // round X to thousandths
...

Example 3: round to nearest decimal javascript

round(12345.6789, 2) // 12345.68
round(12345.6789, 1) // 12345.7