Highest Common Factor of 120, 861, 643 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 120, 861, 643 i.e. 1 the largest integer that leaves a remainder zero for all numbers.
HCF of 120, 861, 643 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 120, 861, 643 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 120, 861, 643 is 1.
HCF(120, 861, 643) = 1
HCF of 120, 861, 643 using Euclid's algorithm
Highest common factor or Highest common divisor (hcd) can be calculated by Euclid's algotithm.
Highest common factor (HCF) of 120, 861, 643 is 1.
Highest Common Factor of 120,861,643 is 1
Step 1: Since 861 > 120, we apply the division lemma to 861 and 120, to get
861 = 120 x 7 + 21
Step 2: Since the reminder 120 ≠ 0, we apply division lemma to 21 and 120, to get
120 = 21 x 5 + 15
Step 3: We consider the new divisor 21 and the new remainder 15, and apply the division lemma to get
21 = 15 x 1 + 6
We consider the new divisor 15 and the new remainder 6,and apply the division lemma to get
15 = 6 x 2 + 3
We consider the new divisor 6 and the new remainder 3,and apply the division lemma to get
6 = 3 x 2 + 0
The remainder has now become zero, so our procedure stops. Since the divisor at this stage is 3, the HCF of 120 and 861 is 3
Notice that 3 = HCF(6,3) = HCF(15,6) = HCF(21,15) = HCF(120,21) = HCF(861,120) .
We can take hcf of as 1st numbers and next number as another number to apply in Euclidean lemma
Step 1: Since 643 > 3, we apply the division lemma to 643 and 3, to get
643 = 3 x 214 + 1
Step 2: Since the reminder 3 ≠ 0, we apply division lemma to 1 and 3, to get
3 = 1 x 3 + 0
The remainder has now become zero, so our procedure stops. Since the divisor at this stage is 1, the HCF of 3 and 643 is 1
Notice that 1 = HCF(3,1) = HCF(643,3) .
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Frequently Asked Questions on HCF of 120, 861, 643 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 120, 861, 643?
Answer: HCF of 120, 861, 643 is 1 the largest number that divides all the numbers leaving a remainder zero.
3. How to find HCF of 120, 861, 643 using Euclid's Algorithm?
Answer: For arbitrary numbers 120, 861, 643 apply Euclid’s Division Lemma in succession until you obtain a remainder zero. HCF is the remainder in the last but one step.