# Can't add math inside fields

**URL:** <https://community.homey.app/t/cant-add-math-inside-fields/132474>\
**Category:** Flows\
**Created:** [March 11, 2025, 7:36am UTC](https://community.homey.app/t/cant-add-math-inside-fields/132474 "2025-03-11T07:36:42Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![Peter\_Kawa](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/peter_kawa/32/173848_2.png) [@Peter\_Kawa](https://community.homey.app/u/Peter_Kawa)\
**Post date:** [March 11, 2025, 9:49pm UTC](https://community.homey.app/t/cant-add-math-inside-fields/132474/4 "2025-03-11T21:49:07Z")

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Duplicate

> [@Available math functions](https://community.homey.app/t/available-math-functions/16622/37):
>
> 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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