> For the complete documentation index, see [llms.txt](https://docs.gpmautomate.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.gpmautomate.com/automate-en/action-guide/text-and-number/math-execute.md).
# Math execute
Math execute is an action used to perform basic mathematical operations (such as addition `+`, subtraction `-`, multiplication `*`, division `/`) or complex arithmetic expressions from available variables, and then store the result in an output variable.
🎥 Watch the tutorial video: [Here](https://youtu.be/nlEQsaxawt4).
#### Configuration parameters:
* Expression: The content of the mathematical operation to be performed. You can combine specific numbers and available variables (For example: `(5 + 3) * 2` or `$price * $quantity`).
* Output variable: The name of the variable to store the result after the calculation is complete.
#### Practical example 1: Calculate the total order amount (Multiply and Add)
Suppose you are creating a script for automatic purchasing or scraping order data. You have a product quantity variable as `$quantity = 3`, a unit price variable as `$price = 150000`, and a fixed shipping fee of `30000`.
* Configuration:
* Expression: Enter the expression `($price * $quantity) + 30000`
* Output variable: Enter the variable name to store the result as `$totalAmount`.
* Result: The system will calculate the value as `480000` and assign it to the variable `$totalAmount`.
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