Prime Numbers

A natural number which can be divided by one and number itself with out leaving remainder is known as prime numbers.

Eg:- 2, 3,5, 7, 11, 13 ,17,19 ,23 etc.

Facts about prime numbers

(i)One is not a prime number.

(ii)Zero is not a prime number.

(iii)Two is only an even prime number. Other even numbers are composite numbers.

Method to find a prime number

Example 1-

Check if 22 a prime number.

Step 1 –

Divide 22 by 2

Division

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22 is divided by 2 with no remainder.

But , 22 is dividing by 1, 2 and 22[number itself]

Hence 22 is not a prime number.

Example 2-

Check if 29 a prime number.

Step 1 –

Divide 29 by 2

picture2prime-numbers

29 can not be divided by 2 without remainder.

Now, try 29 to divide by other prime numbers as 3,5 and so on.

But , 29 can not be divided by any other number without remainder.

Hence, 29 is a prime number.

Table of prime numbers upto 500

schoolhelpbygunjan.wordpress.com,able of prime numbers up to 500 is provided.

Helping Topics

Fractional numbers

Types of fractions                 

Steps to change mixed fraction into improper fraction                

Steps to change improper fraction into mixed fraction                                                         

Method to find equivalent fraction

Ordering of fraction

Cross multiplication

Least common multiple

Whole numbers

Composite numbers

Addition of fractions

Subtraction of fractions

Multiplication of fractions

Division of fractions

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