Composite Numbers from 1 to 100 for Class 1

The reading material provided on this page for Composite Numbers from 1 to 100 is specifically designed for students in grades 5 and 6.

Composite Numbers

A composite number is a positive integer that has at least one positive divisor other than 1 and itself. In other words, it is a number that can be divided by numbers other than 1 and itself. Composite numbers are numbers that have more than two factors.

For example, 4 is composite because it can be divided by 2 and 6 is composite because it can be divided by 2 and 3. The opposite of a composite number is a prime number, which can only be divided by 1 and itself.

Example: Composite numbers include:

-> 4 = (2 x 2)
-> 6 = (2 x 3)
-> 8 = (2 x 4)
-> 9 = (3 x 3)
-> 10 = (2 x 5)
-> 12 = (2 x 6)
-> 14 = (2 x 7)
-> 15 = (3 x 5)
-> 16 = (2 x 2 x 2 x 2)
-> 18 = (2 x 9)
-> 20 = (2 x 10)

NOTE: 1 is not considered a composite number as it cannot be written as the product of two or more positive integers.

How to find Composite Numbers?

1. Understand what a composite number is: A composite number is a positive integer that has at least one positive divisor or factor other than 1 and itself.

2. Start with a list of numbers: Begin by listing the numbers you want to check for being composite.

For example, you can start with the numbers 2, 3, 4, 5, 6, 7, 8, 9, 10 etc.

3. Check for divisibility: For each number in your list, check if it is divisible by any number other than 1 and itself.

For example, 4 is divisible by 2 and also divisible by itself, so it is a composite number.

4. Check by prime factorization: Another way to check for composite numbers is by finding the prime factorization of the number.

For example, the prime factorization of 12 is 2 x 2 x 3, which means that 12 is a composite number.

5. Mark the composite numbers: Once you have identified the composite numbers, mark them in your list.

6. Repeat the process: Repeat the process for any other numbers you want to check for being composite. Remember that all even numbers greater than 2 are composite numbers.

Properties of Composite Numbers

1. Composite numbers are positive integers that are greater than 1 and have more than two factors.

For example, 6 is a composite number because it has factors of 1, 2, 3, and 6.

2. Composite numbers can be written as the product of two or more prime numbers.

For example, 12 can be written as 2 x 2 x 3, which are all prime numbers.

3. Composite numbers are not prime numbers.

For example, 9 is a composite number because it has factors of 1, 3 and 9 but it is not a prime number.

4. Composite numbers are evenly divisible by their factors. Each composite number is a factor of itself.

For example, the smallest composite number is 4

In summary, composite numbers are positive integers greater than 1 that have more than two factors, can be written as the product of two or more prime numbers, are not prime numbers and can be divided by more than just 1 and itself.

Composite Numbers from 1 to 100

Here is a list of composite numbers from 1 to 100.

In the above figure composite numbers 1 to 100 are given, all the marked numbers in a darker shade of green are composite numbers.

For example, 4, 6, 8, 9, 10, and so on.