This calculator works with all 4 operations, and here is how to operate it. To add: Press the space key, then enter the number to add to and the addend. The answer should be shown on the cat. To subtract, press the left arrow key, type in the number to subtract from, and the number to subtract by. To multiply, click the up arrow, enter the number to multiply by, and then the multiplier. To divide, click the down arrow, enter the dividend, and then enter the divisor. For debugging: Inside the project, look for the when M key pressed block. Edit the = block and set it to your username, and then hit M to enter Debug Mode. When in Debug Mode, this DOES NOT: Change the equatiometer, for debugging and to prevent confusion with regular problems. DO NOT: Use Debug mode to save the equations from going too high Abuse or ruin the project Edit any of the variables. This may cause errors.