Adding Two-Digit Numbers with a calculator

Adding two two-digit numbers (for example 45 + 68) with a calculator involves several steps.

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

Enter the plus operation by pressing the + button

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

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

Find the Sum of the two Numbers.