GCF of 2 and 9
GCF of 2 and 9 is the largest possible number that divides 2 and 9 exactly without any remainder. The factors of 2 and 9 are 1, 2 and 1, 3, 9 respectively. There are 3 commonly used methods to find the GCF of 2 and 9  long division, prime factorization, and Euclidean algorithm.
1.  GCF of 2 and 9 
2.  List of Methods 
3.  Solved Examples 
4.  FAQs 
What is GCF of 2 and 9?
Answer: GCF of 2 and 9 is 1.
Explanation:
The GCF of two nonzero integers, x(2) and y(9), is the greatest positive integer m(1) that divides both x(2) and y(9) without any remainder.
Methods to Find GCF of 2 and 9
Let's look at the different methods for finding the GCF of 2 and 9.
 Using Euclid's Algorithm
 Listing Common Factors
 Long Division Method
GCF of 2 and 9 by Euclidean Algorithm
As per the Euclidean Algorithm, GCF(X, Y) = GCF(Y, X mod Y)
where X > Y and mod is the modulo operator.
Here X = 9 and Y = 2
 GCF(9, 2) = GCF(2, 9 mod 2) = GCF(2, 1)
 GCF(2, 1) = GCF(1, 2 mod 1) = GCF(1, 0)
 GCF(1, 0) = 1 (∵ GCF(X, 0) = X, where X ≠ 0)
Therefore, the value of GCF of 2 and 9 is 1.
GCF of 2 and 9 by Listing Common Factors
 Factors of 2: 1, 2
 Factors of 9: 1, 3, 9
Since, 1 is the only common factor between 2 and 9. The Greatest Common Factor of 2 and 9 is 1.
GCF of 2 and 9 by Long Division
GCF of 2 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 2 (smaller number).
 Step 2: Since the remainder ≠ 0, we will divide the divisor of step 1 (2) by the remainder (1).
 Step 3: Repeat this process until the remainder = 0.
The corresponding divisor (1) is the GCF of 2 and 9.
☛ Also Check:
 GCF of 60 and 72 = 12
 GCF of 12 and 60 = 12
 GCF of 14 and 63 = 7
 GCF of 35 and 50 = 5
 GCF of 15 and 24 = 3
 GCF of 48 and 54 = 6
 GCF of 20 and 50 = 10
GCF of 2 and 9 Examples

Example 1: For two numbers, GCF = 1 and LCM = 18. If one number is 9, find the other number.
Solution:
Given: GCF (z, 9) = 1 and LCM (z, 9) = 18
∵ GCF × LCM = 9 × (z)
⇒ z = (GCF × LCM)/9
⇒ z = (1 × 18)/9
⇒ z = 2
Therefore, the other number is 2. 
Example 2: Find the greatest number that divides 2 and 9 exactly.
Solution:
The greatest number that divides 2 and 9 exactly is their greatest common factor, i.e. GCF of 2 and 9.
⇒ Factors of 2 and 9: Factors of 2 = 1, 2
 Factors of 9 = 1, 3, 9
Therefore, the GCF of 2 and 9 is 1.

Example 3: Find the GCF of 2 and 9, if their LCM is 18.
Solution:
∵ LCM × GCF = 2 × 9
⇒ GCF(2, 9) = (2 × 9)/18 = 1
Therefore, the greatest common factor of 2 and 9 is 1.
FAQs on GCF of 2 and 9
What is the GCF of 2 and 9?
The GCF of 2 and 9 is 1. To calculate the greatest common factor of 2 and 9, we need to factor each number (factors of 2 = 1, 2; factors of 9 = 1, 3, 9) and choose the greatest factor that exactly divides both 2 and 9, i.e., 1.
How to Find the GCF of 2 and 9 by Long Division Method?
To find the GCF of 2, 9 using long division method, 9 is divided by 2. The corresponding divisor (1) when remainder equals 0 is taken as GCF.
What is the Relation Between LCM and GCF of 2, 9?
The following equation can be used to express the relation between Least Common Multiple (LCM) and GCF of 2 and 9, i.e. GCF × LCM = 2 × 9.
How to Find the GCF of 2 and 9 by Prime Factorization?
To find the GCF of 2 and 9, we will find the prime factorization of the given numbers, i.e. 2 = 2; 9 = 3 × 3.
⇒ There is no common prime factor for 2 and 9. Hence, GCF (2, 9) = 1.
☛ What is a Prime Number?
If the GCF of 9 and 2 is 1, Find its LCM.
GCF(9, 2) × LCM(9, 2) = 9 × 2
Since the GCF of 9 and 2 = 1
⇒ 1 × LCM(9, 2) = 18
Therefore, LCM = 18
☛ GCF Calculator
What are the Methods to Find GCF of 2 and 9?
There are three commonly used methods to find the GCF of 2 and 9.
 By Prime Factorization
 By Euclidean Algorithm
 By Long Division
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