Divide each number by the other numbers

Oct 13, 2025 by talynt.org 129 views

Introduction

In mathematics, the Highest Common Factor (HCF) is a positive integer that divides two or more numbers without leaving a remainder. It is also known as the Greatest Common Divisor (GCD). The HCF is an essential concept in number theory and has numerous applications in various fields, including algebra, geometry, and cryptography. In this article, we will explore the division method for finding the HCF of a set of numbers.

The Division Method

The division method is a simple and effective way to find the HCF of two or more numbers. The basic idea is to divide each number by the other numbers and find the common factors. Here's a step-by-step guide to the division method:

List the numbers: Write down the numbers for which you want to find the HCF.
Divide each number by the other numbers: Divide each number by the other numbers and find the remainder.
Identify the common factors: Identify the common factors among the remainders.
Find the HCF: The HCF is the product of the common factors.

Examples

Let's apply the division method to find the HCF of the given numbers.

a) $100, 350, 480$

To find the HCF of $100, 350, 480$ , we will divide each number by the other numbers and find the remainder.

Number	Divided by	Remainder
100	350	0
100	480	100
350	100	50
350	480	70
480	100	80
480	350	80

The common factors among the remainders are $10, 20, 40, 80$ . Therefore, the HCF of $100, 350, 480$ is $10 \times 20 \times 40 \times 80 = 640,000$ .

b) $678, 456$

To find the HCF of $678, 456$ , we will divide each number by the other numbers and find the remainder.

Number	Divided by	Remainder
678	456	222
456	678	222

The common factors among the remainders are $2, 3, 37, 222$ . Therefore, the HCF of $678, 456$ is $2 \times 3 \times 37 \times 222 = 88,328$ .

c) $400, 350, 250$

To find the HCF of $400, 350, 250$ , we will divide each number by the other numbers and find the remainder.

Number	Divided by	Remainder
400	350	50
400	250	150
350	400	50
350	250	100
250	400	150
250	350	100

The common factors among the remainders are $2, 5, 10, 25, 50$ . Therefore, the HCF of $400, 350, 250$ is $2 \times 5 \times 10 \times 25 \times 50 = 125,000$ .

d) $100, 245, 168$

To find the HCF of $100, 245, 168$ , we will divide each number by the other numbers and find the remainder.

Number	Divided by	Remainder
100	245	45
100	168	32
245	100	45
245	168	77
168	100	68
168	245	77

The common factors among the remainders are $1, 7, 77$ . Therefore, the HCF of $100, 245, 168$ is $1 \times 7 \times 77 = 539$ .

e) $332, 480, 290$

To find the HCF of $332, 480, 290$ , we will divide each number by the other numbers and find the remainder.

Number	Divided by	Remainder
332	480	68
332	290	42
480	332	148
480	290	190
290	332	42
290	480	190

The common factors among the remainders are $2, 2, 7, 14, 42$ . Therefore, the HCF of $332, 480, 290$ is $2 \times 2 \times 7 \times 14 \times 42 = 28,416$ .

f) $734, 202$

To find the HCF of $734, 202$ , we will divide each number by the other numbers and find the remainder.

Number	Divided by	Remainder
734	202	332
202	734	332

The common factors among the remainders are $2, 166, 332$ . Therefore, the HCF of $734, 202$ is $2 \times 166 \times 332 = 109,984$ .

Conclusion

Q1: What is the Highest Common Factor (HCF)?

A1: The Highest Common Factor (HCF) is a positive integer that divides two or more numbers without leaving a remainder. It is also known as the Greatest Common Divisor (GCD).

Q2: Why is the HCF important?

A2: The HCF is an essential concept in number theory and has numerous applications in various fields, including algebra, geometry, and cryptography. It is used to find the greatest common divisor of two or more numbers, which is useful in solving equations, finding the least common multiple, and other mathematical problems.

Q3: How do I find the HCF of two numbers?

A3: To find the HCF of two numbers, you can use the division method. Divide each number by the other number and find the remainder. The HCF is the product of the common factors among the remainders.

Q4: Can I use the HCF to find the least common multiple (LCM)?

A4: Yes, you can use the HCF to find the least common multiple (LCM) of two numbers. The LCM is the product of the two numbers divided by their HCF.

Q5: How do I find the HCF of more than two numbers?

A5: To find the HCF of more than two numbers, you can use the division method. Divide each number by the other numbers and find the remainder. The HCF is the product of the common factors among the remainders.

Q6: What are some common mistakes to avoid when finding the HCF?

A6: Some common mistakes to avoid when finding the HCF include:

Not checking for common factors among the remainders
Not using the correct method (e.g., division method)
Not considering the negative factors
Not checking for the greatest common divisor

Q7: Can I use a calculator to find the HCF?

A7: Yes, you can use a calculator to find the HCF. Most calculators have a built-in function to find the greatest common divisor (GCD) of two numbers.

Q8: How do I apply the HCF in real-life situations?

A8: The HCF has numerous applications in real-life situations, including:

Finding the greatest common divisor of two or more numbers
Solving equations and inequalities
Finding the least common multiple of two or more numbers
Cryptography and coding theory
Algebra and geometry

Q9: Can I use the HCF to find the prime factorization of a number?

A9: Yes, you can use the HCF to find the prime factorization of a number. The prime factorization of a number is the product of its prime factors.

Q10: How do I extend the HCF to more than two numbers?

A10: To extend the HCF to more than two numbers, you can use the division method. Divide each number by the other numbers and find the remainder. The HCF is the product of the common factors among the remainders.

Conclusion

In conclusion, the HCF is an essential concept in number theory and has numerous applications in various fields. By understanding the HCF and its applications, you can solve mathematical problems and apply the concept in real-life situations.