**Factorisation of Numbers Workbook-2**

**Important points :**

1. 1 is a factor of every number. It is the smallest factor of a number.

2. Every number is a factor of itself. The greatest factors of the number is the number itself.

3. All the factors of the numbers are either less than or equal to the numbers.

4. Every number has at least two factors except number 1.

Read More...**Greatest Common Factors Workbook**

**Odd numbers :** The numbers ending with 1,3,5,7 or 9 are known as odd numbers.

**Even numbers :** the numbers ending with 2,4,6,8 or 0 are known as even numbers.

**Prime and composite numbers**

**Prime Number:**

Let ‘p’ be a natural number ‘p’ is said to be prime if it has exactly two distinct factors, namely 1 and itself.

e.g., 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, …..

There are 25 prime numbers between 1 and 100. These 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.

**Composite Number:**

Let ‘a’ be a natural number, ‘a’ is said to be composite if, it has atleast three distinct factors.

**Note:**

(i) ‘1’ is neither prime nor composite.

(ii) ‘2’ is the only even prime number.

(iii) Number which are not prime are composite numbers (except 1).

(iv) ‘4’ is the smallest composite number.

Read More...