# Simple Maths

**URL:** <https://forum.kirupa.com/t/simple-maths/264203>\
**Category:** flash\
**Created:** [June 24, 2008, 12:10am UTC](https://forum.kirupa.com/t/simple-maths/264203 "2008-06-24T00:10:04Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![sparkdemon](https://avatars.discourse-cdn.com/v4/letter/s/958977/32.png) [@sparkdemon](https://forum.kirupa.com/u/sparkdemon)\
**Post date:** [June 24, 2008, 12:10am UTC](https://forum.kirupa.com/t/simple-maths/264203/1 "2008-06-24T00:10:04Z")

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hello…

I have an application performing a simple calculation of adding and subtracting a amout to/from a balance amount.

The problem is that every thing works fine except that when i remove the lkast amout from the balance ie: 15.25 -15.25 suppose i get something like -5.32907051820075e-15

can some one tell me why

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**Author:** ![TheCanadian](https://avatars.discourse-cdn.com/v4/letter/t/67e7ee/32.png) [@TheCanadian](https://forum.kirupa.com/u/TheCanadian)\
**Post date:** [June 24, 2008, 1:08am UTC](https://forum.kirupa.com/t/simple-maths/264203/2 "2008-06-24T01:08:56Z")

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Floating point arithmetic. -5.32907051820075e-15 is, for all intents and purposes, 0.

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**Author:** ![sparkdemon](https://avatars.discourse-cdn.com/v4/letter/s/958977/32.png) [@sparkdemon](https://forum.kirupa.com/u/sparkdemon)\
**Post date:** [June 24, 2008, 1:13am UTC](https://forum.kirupa.com/t/simple-maths/264203/3 "2008-06-24T01:13:31Z")

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Thank you… i hope i got it 🙂