Is there a way to do simple addition , subtraction , multiplication and division using voice commands?

I am making an AI assistant which could calculate using voice commands

Yes. Use block “If then” for select action after voice commang get.

Can you tell me how to split the command string and then add the constants to give the result

Check it.

https://x.thunkable.com/projects/5b2cafb880f264d7357e1bec/project/properties/designer/