Introduction
Most calculators get their power from a solar cell. This powers the calculator so long as light is available (daylight, electric bulb or even candle-light).
Display
The display shows the answers. The digits in the display are usually made of small line segments.
Keyboard
The keyboard has four main set of keys or buttons:
1. Number keys
Press these keys: “0”, “1”, “2”, “3”, “4”, “5”, “6” ,”7” , “8”, “9” and the decimal point key (usually shown as a dot .) to enter number into the calculator.
2. Basic calculation keys
Press these keys: “+”,” –“, “X”, “÷”, “%”, “√” and “=” to operate on the numbers you have entered, and to display answers.
3. Clearing keys
The “c” key clears the last number you entered. Press “c” if you entered a wrong number by mistake. On some calculator “CE” is written instead of “C”. The “AC” key clears the whole calculation that you are working on. Use this if you want to start from the beginning again. Often the “AC” key is linked to the calculator’s ON key and is written as “ON/AC” or just as “AC”. Press “AC” before starting any calculation and 0 is shown on the display.
4. Memory keys
a. Memory plus key
Press M+ to store the displayed number in the memory of the calculator. If there is any previous number in the number, it adds the displayed number to it.
b. Memory minus key
Press “M -“ to subtract the displayed number from the number in the. The answer obtained from the addition or subtraction will be the new number in the memory…
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