Transcription: When you want to calculate a sum, for example 56 times 9, you start by keying in the first number. The microprocessor stores the code for the number in its memory and then sends the code to the display. You then press a key to tell the calculator what operation you want it to do, for example multiplication. The code for this is also stored in the memory. You then input the second number, which is again stored and displayed. Finally, you press the equals key. This tells the microprocessor to look in the memory, perform the operation on the two numbers, and send the result to the display.
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