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HCF of 3 and 9

HCF of 3 and 9 is the largest possible number that divides 3 and 9 exactly without any remainder. The factors of 3 and 9 are 1, 3 and 1, 3, 9 respectively. There are 3 commonly used methods to find the HCF of 3 and 9 - prime factorization, Euclidean algorithm, and long division.

1.	HCF of 3 and 9
2.	List of Methods
3.	Solved Examples
4.	FAQs

What is HCF of 3 and 9?

Answer: HCF of 3 and 9 is 3.

Explanation:

The HCF of two non-zero integers, x(3) and y(9), is the highest positive integer m(3) that divides both x(3) and y(9) without any remainder.

Methods to Find HCF of 3 and 9

The methods to find the HCF of 3 and 9 are explained below.

Long Division Method
Prime Factorization Method
Listing Common Factors

HCF of 3 and 9 by Long Division

HCF of 3 and 9 is the divisor that we get when the remainder becomes 0 after doing long division repeatedly.

Step 1: Divide 9 (larger number) by 3 (smaller number).
Step 2: Since the remainder = 0, the divisor (3) is the HCF of 3 and 9.

The corresponding divisor (3) is the HCF of 3 and 9.

HCF of 3 and 9 by Prime Factorization

Prime factorization of 3 and 9 is (3) and (3 × 3) respectively. As visible, 3 and 9 have only one common prime factor i.e. 3. Hence, the HCF of 3 and 9 is 3.

HCF of 3 and 9 by Listing Common Factors

Factors of 3: 1, 3
Factors of 9: 1, 3, 9

There are 2 common factors of 3 and 9, that are 1 and 3. Therefore, the highest common factor of 3 and 9 is 3.

☛ Also Check:

HCF of 3 and 9 Examples

Example 1: Find the highest number that divides 3 and 9 exactly.

Solution:

The highest number that divides 3 and 9 exactly is their highest common factor, i.e. HCF of 3 and 9.
⇒ Factors of 3 and 9:
- Factors of 3 = 1, 3
- Factors of 9 = 1, 3, 9
Therefore, the HCF of 3 and 9 is 3.
Example 2: Find the HCF of 3 and 9, if their LCM is 9.

Solution:

∵ LCM × HCF = 3 × 9
⇒ HCF(3, 9) = (3 × 9)/9 = 3
Therefore, the highest common factor of 3 and 9 is 3.
Example 3: For two numbers, HCF = 3 and LCM = 9. If one number is 9, find the other number.

Solution:

Given: HCF (z, 9) = 3 and LCM (z, 9) = 9
∵ HCF × LCM = 9 × (z)
⇒ z = (HCF × LCM)/9
⇒ z = (3 × 9)/9
⇒ z = 3
Therefore, the other number is 3.

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FAQs on HCF of 3 and 9

What is the HCF of 3 and 9?

The HCF of 3 and 9 is 3. To calculate the HCF (Highest Common Factor) of 3 and 9, we need to factor each number (factors of 3 = 1, 3; factors of 9 = 1, 3, 9) and choose the highest factor that exactly divides both 3 and 9, i.e., 3.

If the HCF of 9 and 3 is 3, Find its LCM.

HCF(9, 3) × LCM(9, 3) = 9 × 3
Since the HCF of 9 and 3 = 3
⇒ 3 × LCM(9, 3) = 27
Therefore, LCM = 9
☛ HCF Calculator

How to Find the HCF of 3 and 9 by Prime Factorization?

To find the HCF of 3 and 9, we will find the prime factorization of the given numbers, i.e. 3 = 3; 9 = 3 × 3.
⇒ Since 3 is the only common prime factor of 3 and 9. Hence, HCF (3, 9) = 3.
☛ Prime Numbers

How to Find the HCF of 3 and 9 by Long Division Method?

To find the HCF of 3, 9 using long division method, 9 is divided by 3. The corresponding divisor (3) when remainder equals 0 is taken as HCF.

What are the Methods to Find HCF of 3 and 9?

There are three commonly used methods to find the HCF of 3 and 9.

By Prime Factorization
By Long Division
By Euclidean Algorithm

What is the Relation Between LCM and HCF of 3, 9?

The following equation can be used to express the relation between Least Common Multiple and HCF of 3 and 9, i.e. HCF × LCM = 3 × 9.

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