- Check if the calculator is a normal calculator or scientific calculator
- Verify that all the buttons are present and text written on them is readable
- Check the arithmetic operations are working fine- +, -, /, * etc
- Verify that BODMAS is applied in case of complex queries and correct result is returned
- Verify that the calculator gives the correct result in case of operations containing decimal numbers
- Check if the calculator is battery operated or works on solar power
- Verify the outer body material of the calculator
- Verify the spacing between the two buttons, the buttons should not be too closely placed
- Check the pressure required to press a button, the pressure required should not be too high
- Verify the number of digits allowed to enter in the calculator for any operation
- Verify the limit of the response value
- Verify the functioning of memory functions
- Check if calculator allows to navigate through previous calculations
- Verify that hitting ‘C’ cancels any digits or operation added
- Verify the working of ON-OFF button in the calculator
- Check if keeping the calculator unused for certain period of time, turns it off automatically
- Verify that on pressing two operators one after the other, the latest one will override the previous operator
- Verify the state of the calculator when two buttons are pressed simultaneously
- Verify if user can delete a digits one by one using backspace key

*Check the below link for a complete set of test cases for different applications.*