How to divide using a calculator

If you have not selected Reverse Polish Notation (RPN) mode, or Conversion mode, then division is as simple as:

number ⨸ number =⃝

If you have selected RPN mode, then it is different:

number enter number ⨸

See: Calculator User Guide for Mac - Apple Support

What is happening when you try an example such as this one. Ignore the commas (,) in the example, then will be added automatically depending on your region. This is the standard Apple Calculator found in your Applications folder.