So to use the calculator, click Start/Clear, then click what number you are using and hit enter/return on your keyboard, then enter the second number you are going to use and hit enter/return on your keyboard, then click what operation you want to use (i.e. Addition, Subtraction, Multiplication, Division). For adding, hit the white button, for subtracting, hit the red button, for multiplying, hit the black button, and for dividing, hit the blue button.
