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HCF of 4 and 5

HCF of 4 and 5 is the largest possible number that divides 4 and 5 exactly without any remainder. The factors of 4 and 5 are 1, 2, 4 and 1, 5 respectively. There are 3 commonly used methods to find the HCF of 4 and 5 - Euclidean algorithm, long division, and prime factorization.

1.	HCF of 4 and 5
2.	List of Methods
3.	Solved Examples
4.	FAQs

What is HCF of 4 and 5?

Answer: HCF of 4 and 5 is 1.

Explanation:

The HCF of two non-zero integers, x(4) and y(5), is the highest positive integer m(1) that divides both x(4) and y(5) without any remainder.

Methods to Find HCF of 4 and 5

The methods to find the HCF of 4 and 5 are explained below.

Long Division Method
Listing Common Factors
Using Euclid's Algorithm

HCF of 4 and 5 by Long Division

HCF of 4 and 5 is the divisor that we get when the remainder becomes 0 after doing long division repeatedly.

Step 1: Divide 5 (larger number) by 4 (smaller number).
Step 2: Since the remainder ≠ 0, we will divide the divisor of step 1 (4) by the remainder (1).
Step 3: Repeat this process until the remainder = 0.

The corresponding divisor (1) is the HCF of 4 and 5.

HCF of 4 and 5 by Listing Common Factors

Factors of 4: 1, 2, 4
Factors of 5: 1, 5

Since, 1 is the only common factor between 4 and 5. The highest common factor of 4 and 5 is 1.

HCF of 4 and 5 by Euclidean Algorithm

As per the Euclidean Algorithm, HCF(X, Y) = HCF(Y, X mod Y)
where X > Y and mod is the modulo operator.

Here X = 5 and Y = 4

HCF(5, 4) = HCF(4, 5 mod 4) = HCF(4, 1)
HCF(4, 1) = HCF(1, 4 mod 1) = HCF(1, 0)
HCF(1, 0) = 1 (∵ HCF(X, 0) = |X|, where X ≠ 0)

Therefore, the value of HCF of 4 and 5 is 1.

☛ Also Check:

HCF of 4 and 5 Examples

Example 1: Find the highest number that divides 4 and 5 exactly.

Solution:

The highest number that divides 4 and 5 exactly is their highest common factor, i.e. HCF of 4 and 5.
⇒ Factors of 4 and 5:
- Factors of 4 = 1, 2, 4
- Factors of 5 = 1, 5
Therefore, the HCF of 4 and 5 is 1.
Example 2: Find the HCF of 4 and 5, if their LCM is 20.

Solution:

∵ LCM × HCF = 4 × 5
⇒ HCF(4, 5) = (4 × 5)/20 = 1
Therefore, the highest common factor of 4 and 5 is 1.
Example 3: The product of two numbers is 20. If their HCF is 1, what is their LCM?

Solution:

Given: HCF = 1 and product of numbers = 20
∵ LCM × HCF = product of numbers
⇒ LCM = Product/HCF = 20/1
Therefore, the LCM is 20.

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FAQs on HCF of 4 and 5

What is the HCF of 4 and 5?

The HCF of 4 and 5 is 1. To calculate the HCF of 4 and 5, we need to factor each number (factors of 4 = 1, 2, 4; factors of 5 = 1, 5) and choose the highest factor that exactly divides both 4 and 5, i.e., 1.

How to Find the HCF of 4 and 5 by Prime Factorization?

To find the HCF of 4 and 5, we will find the prime factorization of the given numbers, i.e. 4 = 2 × 2; 5 = 5.
⇒ There is no common prime factor for 4 and 5. Hence, HCF (4, 5) = 1.
☛ Prime Numbers

How to Find the HCF of 4 and 5 by Long Division Method?

To find the HCF of 4, 5 using long division method, 5 is divided by 4. The corresponding divisor (1) when remainder equals 0 is taken as HCF.

What are the Methods to Find HCF of 4 and 5?

There are three commonly used methods to find the HCF of 4 and 5.

By Long Division
By Prime Factorization
By Listing Common Factors

What is the Relation Between LCM and HCF of 4, 5?

The following equation can be used to express the relation between Least Common Multiple and HCF of 4 and 5, i.e. HCF × LCM = 4 × 5.

If the HCF of 5 and 4 is 1, Find its LCM.

HCF(5, 4) × LCM(5, 4) = 5 × 4
Since the HCF of 5 and 4 = 1
⇒ 1 × LCM(5, 4) = 20
Therefore, LCM = 20
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