Home/ Questions/Q 880273
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-15T12:04:15+00:00

is there a better way to multiply and divide figures than using the *

  • 0

is there a better way to multiply and divide figures than using the * and / ?

There is a strange behavior in Chrome Firefox and Internet Explorer using those operaters:

x1 = 9999.8
x1 * 100 = 999979.9999999999
x1 * 100 / 100 = 9999.8
x1 / 100 = 99.99799999999999

http://jsbin.com/ekoye3/

I am trying to round down the user input with parseInt ( x1 * 100 ) / 100 and the result for 9999.8 is 9999.79

Should I use another way to achieve this?

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    That’s no bug. You may want to check out:

    Integer arithmetic in floating-point is exact, so decimal representation errors can be avoided by scaling. For example:

    x1 = 9999.8;                            // Your example
console.log(x1 * 100);                  // 999979.9999999999
console.log(x1 * 100 / 100);            // 9999.8
console.log(x1 / 100);                  // 99.99799999999999

x1 = 9999800;                           // Your example scaled by 1000
console.log((x1 * 100) / 10000);        // 999980
console.log((x1 * 100 / 100) / 10000);  // 9999.8
console.log((x1 / 100) / 10000);        // 99.998
    • 0