Contest: Tech review| Basic Calculator

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Hello fellow steemians, I am always touched by this community for the inspiring contests they always organize. This contest is about tech review, which I can't wait to participate because, we are now fully utilizing scientific discoveries. I am going to write a review of a basic calculator as my presentation for this contest.
What is a calculator ?
A calculator is a device which is basically used for mathematical calculations. I use this device for almost all my tasks involving calculations.
A basic calculator has limited functions as compared to the powerful ones. The basic calculator has keys and a rectangular screen. The keys are; the memory keys, operational keys and the numeric keys. The memory keys on a basic calculator are [m+] key, [m-] key and [mr] key. The default memory of this device is 0.
FUNCTIONS OF THE VARIOUS KEYS
When the [m+] key is pressed, the displayed figure on the screen is added to the default memory number. However, the number on the screen is subtracted from the default number when the [m-] key is pressed.

[mr] key: This is purposely for recalling a number in the memory. 

[ mc] : This key is used to clear the memory to zero.

[AC] : This key is used to clear the calculation on the screen.

[Delete] This key erases one character from the right when pressed . The number of times this key is pressed is the same number of characters from the right that will be deleted.

[OFF/ON]: This key is pressed to on or off simple basic calculators. It doesnt do the same with powerful calculators.
[ √ ]: this is a square root sign which is used to raise a number by ½. For example; √4 = 2. This means that 4 divided by 12 equals two.
[ . ]: The decimal key is used when dealing with decimal figures and usually appears in calculations involving remainders.

[ = ]: The equal key is pressed to display the result value after inputs.

The numeric keys have values ranging from 0 to 9.These are the keys which are pressed depending on the value to input.

The operational keys: These keys are addition[+], multiplication, subtraction and division which are usually found in basic calculators.

• The addition key is for adding values.

• The subtraction key is used to subtract values.

• The multiplication key is used to multiply two values.

• The division key is used to divide values.
  NB: The calculator is for basic calculatios.

The above content is a review of a basic calculator.

My sincere gratitude goes to admins of this community for the special contest, ' TECH REVIEW ' carried.

Thanks for reading.