Welcome to the Make community!
1. You don’t really need to use the Math module, as you’re not using advanced math functions like sqrt. The entire expression can be inserted into the Slack module using the built-in functions and operators.
2. Your brackets, operators, functions, or special variables were not selected from the Variables Panel. Try selecting it again from the Variables Panel, or type curly brackets like these {{ }} so that it ends up with a background color:
{{ ( }}
{{ / }}
{{ + }}
{{ = }}
etc.
I also suggest doing this Make Academy, as it covers selecting brackets, operators, functions, or special variables from the Variables Panel.
For more information, see:
- Error Handling Unit 2 - if condition always true - #2 by samliew
- How to make a basic SUM (x+x+x..) function in Make? Is it possible to use Numeric Agreggator? - #2 by samliew
- Formulas not evaluating in modules (Set Variable, Sheets) - Output is literal formula string - #2 by samliew
Proposed example:
{{ (parseNumber(3.`$1`) / 1.data.rates.VES - 1) * 100 }}
Make Input Markup: Copy-paste the above into the field, including start/end curly brackets for it to import as intended
You may need to replace the variables with your own.
— @samliew