Composite Number
What is composite number?
A number that has more than two different factors is a
composite number. So, a composite number is also exactly divisible by numbers
other than 1 and itself.
A whole number having at least 3 factors is called the
composite number.
Consider the numbers 4, 6 and 15.
(i) The factors of 4 are 
1 × 4 = 4
2 × 2 = 4
4 × 1 = 4
So, 1, 2 and 4 are the factors of 4.
(ii) The factors of 6 are 
1 × 6 = 6
2 × 3 = 6
6 × 1 = 6
So, 1, 2, 3 and 6 are the factors of 6.
(iii) The factors of 15 are 
1 × 15 = 15
3 × 5 = 15
5 × 3 = 15
15 × 1 = 15
So, 1, 3, 5 and 15 are the factors of 15.
Thus 4, 6 and 15 are composite numbers.
Let us find all the factors of 4, 6, 8 and 9
4 is divisible by 2, 1 and 4. So, the factors are 1, 2 and
4.
6 is divisible by 2, 3, 1 and 6. So, the factors are 1, 2, 3
and 6.
8 is divisible by 2, 4, 1 and 8. So, the factors are 1, 2, 4
and 8.
9 is divisible by 3, 1 and 9. So, the factors are 1, 3 and
9.
Note:
The number 1 is neither prime nor composite. 1 is called a unique number. The number 1 has exactly one factor the number itself.
The number 2 is a prime as well as an even number.
Composite numbers include both even and odd numbers.
You might like these

We will discuss here about the method of h.c.f. (highest common factor). The highest common factor or HCF of two or more numbers is the greatest number which divides exactly the given numbers. Let us consider two numbers 16 and 24.

In 4th grade factors and multiples worksheet we will find the factors of a number by using multiplication method, find the even and odd numbers, find the prime numbers and composite numbers, find the prime factors, find the common factors, find the HCF(highest common factors

Examples on multiples on different types of questions on multiples are discussed here stepbystep. Every number is a multiple of itself. Every number is a multiple of 1. Every multiple of a number is either greater than or equal to the number. Product of two or more numbers

In worksheet on word problems on H.C.F. and L.C.M. we will find the greatest common factor of two or more numbers and the least common multiple of two or more numbers and their word problems. I. Find the highest common factor and least common multiple of the following pairs

Let us consider some of the word problems on l.c.m. (least common multiple). 1. Find the lowest number which is exactly divisible by 18 and 24. We find the L.C.M. of 18 and 24 to get the required number.

Let us consider some of the word problems on H.C.F. (highest common factor). 1. Two wires are 12 m and 16 m long. The wires are to be cut into pieces of equal length. Find the maximum length of each piece. 2.Find the greatest number which is less by 2 to divide 24, 28 and 64

The least common multiple (L.C.M.) of two or more numbers is the smallest number which can be exactly divided by each of the given number. The lowest common multiple or LCM of two or more numbers is the smallest of all common multiples.

Common multiples of two or more given numbers are the numbers which can exactly be divided by each of the given numbers. Consider the following. (i) Multiples of 3 are: 3, 6, 9, 12, 15, 18, 21, 24, …………etc. Multiples of 4 are: 4, 8, 12, 16, 20, 24, 28, …………… etc.

In worksheet on multiples of that numbers, all grade students can practice the questions on multiples. This exercise sheet on multiples can be practiced by the students to get more ideas on the numbers that are being multiplied. 1. Write any four multiples of: 7

Prime factorisation or complete factorisation of the given number is to express a given number as a product of prime factor. When a number is expressed as the product of its prime factors, it is called prime factorization. For example, 6 = 2 × 3. So 2 and 3 are prime factors

Prime factor is the factor of the given number which is a prime number also. How to find the prime factors of a number? Let us take an example to find prime factors of 210. We need to divide 210 by the first prime number 2 we get 105. Now we need to divide 105 by the prime

The properties of multiples are discussed step by step according to its property. Every number is a multiple of 1. Every number is the multiple of itself. Zero (0) is a multiple of every number. Every multiple except zero is either equal to or greater than any of its factors

What are multiples? ‘The product obtained on multiplying two or more whole numbers is called a multiple of that number or the numbers being multiplied.’ We know that when two numbers are multiplied the result is called the product or the multiple of given numbers.

Practice the questions given in the worksheet on hcf (highest common factor) by factorization method, prime factorization method and division method. Find the common factors of the following numbers. (i) 6 and 8 (ii) 9 and 15 (iii) 16 and 18 (iv) 16 and 28

In this method we first divide the greater number by the smaller number. The remainder becomes the new divisor and the previous divisor as the new dividend. We continue the process until we get 0 remainder. Finding highest common factor (H.C.F) by prime factorization for
4th Grade Math Activities
From Composite Number to HOME PAGE
Didn't find what you were looking for? Or want to know more information
about Math Only Math.
Use this Google Search to find what you need.
Share this page:
What’s this?


New! Comments
Have your say about what you just read! Leave me a comment in the box below. Ask a Question or Answer a Question.