# Odd calculation error

**URL:** <https://forum.kirupa.com/t/odd-calculation-error/319138>\
**Category:** flash\
**Created:** [February 10, 2011, 2:11am UTC](https://forum.kirupa.com/t/odd-calculation-error/319138 "2011-02-10T02:11:16Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![nickrosier](https://avatars.discourse-cdn.com/v4/letter/n/85e7bf/32.png) [@nickrosier](https://forum.kirupa.com/u/nickrosier)\
**Post date:** [February 10, 2011, 2:11am UTC](https://forum.kirupa.com/t/odd-calculation-error/319138/1 "2011-02-10T02:11:16Z")

</div>

So got a very odd result from a maths operation:

```auto
var myNumber = 6.3 + 9.1;
trace(myNumber);

```

returns not 15.4, as you would expect, but 15.399999999999999

any ideas?