Highest Common Factor of 643, 138, 72 using Euclid's algorithm
Created By : Jatin Gogia
Reviewed By : Rajasekhar Valipishetty
Last Updated : Apr 06, 2023
HCF Calculator using the Euclid Division Algorithm helps you to find the Highest common factor (HCF) easily for 643, 138, 72 i.e. 1 the largest integer that leaves a remainder zero for all numbers.
HCF of 643, 138, 72 is 1 the largest number which exactly divides all the numbers i.e. where the remainder is zero. Let us get into the working of this example.
Consider we have numbers 643, 138, 72 and we need to find the HCF of these numbers. To do so, we need to choose the largest integer first and then as per Euclid's Division Lemma a = bq + r where 0 ≤ r ≤ b
Highest common factor (HCF) of 643, 138, 72 is 1.
HCF(643, 138, 72) = 1
HCF of 643, 138, 72 using Euclid's algorithm
Highest common factor or Highest common divisor (hcd) can be calculated by Euclid's algotithm.
Highest common factor (HCF) of 643, 138, 72 is 1.
Highest Common Factor of 643,138,72 is 1
Step 1: Since 643 > 138, we apply the division lemma to 643 and 138, to get
643 = 138 x 4 + 91
Step 2: Since the reminder 138 ≠ 0, we apply division lemma to 91 and 138, to get
138 = 91 x 1 + 47
Step 3: We consider the new divisor 91 and the new remainder 47, and apply the division lemma to get
91 = 47 x 1 + 44
We consider the new divisor 47 and the new remainder 44,and apply the division lemma to get
47 = 44 x 1 + 3
We consider the new divisor 44 and the new remainder 3,and apply the division lemma to get
44 = 3 x 14 + 2
We consider the new divisor 3 and the new remainder 2,and apply the division lemma to get
3 = 2 x 1 + 1
We consider the new divisor 2 and the new remainder 1,and apply the division lemma to get
2 = 1 x 2 + 0
The remainder has now become zero, so our procedure stops. Since the divisor at this stage is 1, the HCF of 643 and 138 is 1
Notice that 1 = HCF(2,1) = HCF(3,2) = HCF(44,3) = HCF(47,44) = HCF(91,47) = HCF(138,91) = HCF(643,138) .
We can take hcf of as 1st numbers and next number as another number to apply in Euclidean lemma
Step 1: Since 72 > 1, we apply the division lemma to 72 and 1, to get
72 = 1 x 72 + 0
The remainder has now become zero, so our procedure stops. Since the divisor at this stage is 1, the HCF of 1 and 72 is 1
Notice that 1 = HCF(72,1) .
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Frequently Asked Questions on HCF of 643, 138, 72 using Euclid's Algorithm
1. What is the Euclid division algorithm?
Answer: Euclid's Division Algorithm is a technique to compute the Highest Common Factor (HCF) of given positive integers.
2. what is the HCF of 643, 138, 72?
Answer: HCF of 643, 138, 72 is 1 the largest number that divides all the numbers leaving a remainder zero.
3. How to find HCF of 643, 138, 72 using Euclid's Algorithm?
Answer: For arbitrary numbers 643, 138, 72 apply Euclid’s Division Lemma in succession until you obtain a remainder zero. HCF is the remainder in the last but one step.