Subtracting with a calculator

How to subtracting two-digit numbers (for example 68 - 45 ) with a calculator.

Enter the first number by pressing the 6 button and the 8 button

Enter the minus operation by pressing the button

Enter the number 45 by pressing the 4 button and the 5 button

Press the = button to make the calculator determine the answer.

Find the Difference between the two Numbers