### Find the prime number from 1 to 100 just in 5 second (Math Prime Number Shortcut tricks)...

An interesting math shortcut prime number trick find the prime number from 1 to 100 (Just in 5 second)

Before starting this math shortcuts prime number trick let us revise the prime number defination

"A number is greater than 1 is called a prime number, if it has only two factors, 1 and the number itself".

This math shortcuts prime number trick is used to find all prime numbers between 1 and 100.

First arrange numbers in a table like following chart. Enter 6 numbers in each row then start the next row.

1- Cross out 1 because according to defination it is not prime number

2- Encircle the 2 with a red color then draw red line (for cross out) on all multiple of 2.

3- Encircle the 3 with a blue color then draw blue line (for cross out) on all multiple of 3.

4- Encircle the 5 with a Green color then draw Green line (for cross out) on all multiple of 5.

5- Encircle the 7 with a Yellow color then draw Yellow line (for cross out) on all multiple of 7.

6- Encircle the 11 and search for multiple of 11 in remaining number. We notice that there is no multiple of 11 in remaining numbers.

7- No need further process because there is no multiple exist in remaining numbers. So just encircles the remaining number. Encircles number are the required prime number.

Thefore the prime number between 1 and 100 are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97.

They are total 25.

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##### NUMBERING SYSTEM QUESTION

Is zero even number or odd number (Even, Odd, Both, Neither even nor odd)...?
What is the lowest odd prime number (2, 3, -2, -3)...?
What are the consective prime number (2 and 3, 5 and 7, 11 and 13, all above)...?
Which number is prime number (1, 39, 49, None)...?
1 is prime or composite number (Prime, Composite, both, Neither Prime nor composite)..?
Give me numbers which are neither prime nor composite (0, 1, 0 and 1, None)?
All non prime number are also the composite number. (True or False)?
Which number neither prime nor composite (1, 29, 39, None)...?
What is the largest composite number less than 20 (17,18,19,20). ?
What is largest composite number less then 30 (23, 25, 28, 29)?
The number 4, 6, 8, 9, ... are (odd, even, prime, composite number) ...?
All even number greater then 2 are composite number (True, False)... ?
How many prime number are between 10 and 30 (5, 6, 7, 8)?
How many prime number are between 1 and 100 (25, 27, 29, 31)?
Which of the following is prime number (703,731,797,729)...?
##### MATH SHORTCUTS

Addition Shortcuts
Division Shortcuts