HCF of 12, 18 and 24
HCF of 12, 18 and 24 is the largest possible number that divides 12, 18 and 24 exactly without any remainder. The factors of 12, 18 and 24 are (1, 2, 3, 4, 6, 12), (1, 2, 3, 6, 9, 18) and (1, 2, 3, 4, 6, 8, 12, 24) respectively. There are 3 commonly used methods to find the HCF of 12, 18 and 24  Euclidean algorithm, long division, and prime factorization.
1.  HCF of 12, 18 and 24 
2.  List of Methods 
3.  Solved Examples 
4.  FAQs 
What is HCF of 12, 18 and 24?
Answer: HCF of 12, 18 and 24 is 6.
Explanation:
The HCF of three nonzero integers, x(12), y(18) and z(24), is the highest positive integer m(6) that divides x(12), y(18) and z(24) without any remainder.
Methods to Find HCF of 12, 18 and 24
Let's look at the different methods for finding the HCF of 12, 18 and 24.
 Using Euclid's Algorithm
 Prime Factorization Method
 Long Division Method
HCF of 12, 18 and 24 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.
HCF(12, 18, 24) = HCF(HCF(12, 18), 24)
 HCF(18, 12) = HCF(12, 18 mod 12) = HCF(12, 6)
 HCF(12, 6) = HCF(6, 12 mod 6) = HCF(6, 0)
 HCF(6, 0) = 6 (∵ HCF(X, 0) = X, where X ≠ 0)
Steps for HCF(6, 24)
 HCF(24, 6) = HCF(6, 24 mod 6) = HCF(6, 0)
 HCF(6, 0) = 6 (∵ HCF(X, 0) = X, where X ≠ 0)
Therefore, the value of HCF of 12, 18 and 24 is 6.
HCF of 12, 18 and 24 by Prime Factorization
Prime factorization of 12, 18 and 24 is (2 × 2 × 3), (2 × 3 × 3) and (2 × 2 × 2 × 3) respectively. As visible, 12, 18 and 24 have common prime factors. Hence, the HCF of 12, 18 and 24 is 2 × 3 = 6.
HCF of 12, 18 and 24 by Long Division
HCF of 12, 18 and 24 can be represented as HCF of (HCF of 12, 18) and 24. HCF(12, 18, 24) can be thus calculated by first finding HCF(12, 18) using long division and thereafter using this result with 24 to perform long division again.
 Step 1: Divide 18 (larger number) by 12 (smaller number).
 Step 2: Since the remainder ≠ 0, we will divide the divisor of step 1 (12) by the remainder (6). Repeat this process until the remainder = 0.
⇒ HCF(12, 18) = 6.  Step 3: Now to find the HCF of 6 and 24, we will perform a long division on 24 and 6.
 Step 4: For remainder = 0, divisor = 6 ⇒ HCF(6, 24) = 6
Thus, HCF(12, 18, 24) = HCF(HCF(12, 18), 24) = 6.
☛ Also Check:
 HCF of 12, 15 and 21 = 3
 HCF of 404 and 96 = 4
 HCF of 12, 24 and 36 = 12
 HCF of 36 and 63 = 9
 HCF of 399 and 437 = 19
 HCF of 117 and 221 = 13
 HCF of 72, 126 and 168 = 6
HCF of 12, 18 and 24 Examples

Example 1: Calculate the HCF of 12, 18, and 24 using LCM of the given numbers.
Solution:
Prime factorization of 12, 18 and 24 is given as,
 12 = 2 × 2 × 3
 18 = 2 × 3 × 3
 24 = 2 × 2 × 2 × 3
LCM(12, 18) = 36, LCM(18, 24) = 72, LCM(24, 12) = 24, LCM(12, 18, 24) = 72
⇒ HCF(12, 18, 24) = [(12 × 18 × 24) × LCM(12, 18, 24)]/[LCM(12, 18) × LCM (18, 24) × LCM(24, 12)]
⇒ HCF(12, 18, 24) = (5184 × 72)/(36 × 72 × 24)
⇒ HCF(12, 18, 24) = 6.
Therefore, the HCF of 12, 18 and 24 is 6. 
Example 2: Find the highest number that divides 12, 18, and 24 completely.
Solution:
The highest number that divides 12, 18, and 24 exactly is their highest common factor.
 Factors of 12 = 1, 2, 3, 4, 6, 12
 Factors of 18 = 1, 2, 3, 6, 9, 18
 Factors of 24 = 1, 2, 3, 4, 6, 8, 12, 24
The HCF of 12, 18, and 24 is 6.
∴ The highest number that divides 12, 18, and 24 is 6. 
Example 3: Verify the relation between the LCM and HCF of 12, 18 and 24.
Solution:
The relation between the LCM and HCF of 12, 18 and 24 is given as, HCF(12, 18, 24) = [(12 × 18 × 24) × LCM(12, 18, 24)]/[LCM(12, 18) × LCM (18, 24) × LCM(12, 24)]
⇒ Prime factorization of 12, 18 and 24: 12 = 2 × 2 × 3
 18 = 2 × 3 × 3
 24 = 2 × 2 × 2 × 3
∴ LCM of (12, 18), (18, 24), (12, 24), and (12, 18, 24) is 36, 72, 24, and 72 respectively.
Now, LHS = HCF(12, 18, 24) = 6.
And, RHS = [(12 × 18 × 24) × LCM(12, 18, 24)]/[LCM(12, 18) × LCM (18, 24) × LCM(12, 24)] = [(5184) × 72]/[36 × 72 × 24]
LHS = RHS = 6.
Hence verified.
FAQs on HCF of 12, 18 and 24
What is the HCF of 12, 18 and 24?
The HCF of 12, 18 and 24 is 6. To calculate the highest common factor of 12, 18 and 24, we need to factor each number (factors of 12 = 1, 2, 3, 4, 6, 12; factors of 18 = 1, 2, 3, 6, 9, 18; factors of 24 = 1, 2, 3, 4, 6, 8, 12, 24) and choose the highest factor that exactly divides 12, 18 and 24, i.e., 6.
What is the Relation Between LCM and HCF of 12, 18 and 24?
The following equation can be used to express the relation between LCM (Least Common Multiple) and HCF of 12, 18 and 24, i.e. HCF(12, 18, 24) = [(12 × 18 × 24) × LCM(12, 18, 24)]/[LCM(12, 18) × LCM (18, 24) × LCM(12, 24)].
☛ Highest Common Factor Calculator
How to Find the HCF of 12, 18 and 24 by Prime Factorization?
To find the HCF of 12, 18 and 24, we will find the prime factorization of given numbers, i.e. 12 = 2 × 2 × 3; 18 = 2 × 3 × 3; 24 = 2 × 2 × 2 × 3.
⇒ Since 2, 3 are common terms in the prime factorization of 12, 18 and 24. Hence, HCF(12, 18, 24) = 2 × 3 = 6
☛ Prime Number
Which of the following is HCF of 12, 18 and 24? 6, 36, 40, 30, 73, 44
HCF of 12, 18, 24 will be the number that divides 12, 18, and 24 without leaving any remainder. The only number that satisfies the given condition is 6.
What are the Methods to Find HCF of 12, 18 and 24?
There are three commonly used methods to find the HCF of 12, 18 and 24.
 By Long Division
 By Prime Factorization
 By Euclidean Algorithm
visual curriculum