# Available math functions

**URL:** <https://community.homey.app/t/available-math-functions/16622>\
**Category:** Questions & Help\
**Created:** [August 9, 2019, 9:48am UTC](https://community.homey.app/t/available-math-functions/16622 "2019-08-09T09:48:17Z")\
**Posts on this page:** 1\
**Showing post:** 37

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**Author:** ![Patrick\_Spadrille](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/patrick_spadrille/32/120160_2.png) [@Patrick\_Spadrille](https://community.homey.app/u/Patrick_Spadrille)\
**Post date:** [March 11, 2025, 7:19am UTC](https://community.homey.app/t/available-math-functions/16622/37 "2025-03-11T07:19:35Z")

</div>

I try to do some math inside the card to set a variable to a number. In the number field, i entered {{10+20}} but when i press ENTER, it just delete what i have put in the field. What am i doing wrong?

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