Highest Common Factor of 40, 78, 121, 642 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 40, 78, 121, 642 i.e. 1 the largest integer that leaves a remainder zero for all numbers.
HCF of 40, 78, 121, 642 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 40, 78, 121, 642 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 40, 78, 121, 642 is 1.
HCF(40, 78, 121, 642) = 1
HCF of 40, 78, 121, 642 using Euclid's algorithm
Highest common factor or Highest common divisor (hcd) can be calculated by Euclid's algotithm.
Highest common factor (HCF) of 40, 78, 121, 642 is 1.
Highest Common Factor of 40,78,121,642 is 1
Step 1: Since 78 > 40, we apply the division lemma to 78 and 40, to get
78 = 40 x 1 + 38
Step 2: Since the reminder 40 ≠ 0, we apply division lemma to 38 and 40, to get
40 = 38 x 1 + 2
Step 3: We consider the new divisor 38 and the new remainder 2, and apply the division lemma to get
38 = 2 x 19 + 0
The remainder has now become zero, so our procedure stops. Since the divisor at this stage is 2, the HCF of 40 and 78 is 2
Notice that 2 = HCF(38,2) = HCF(40,38) = HCF(78,40) .
We can take hcf of as 1st numbers and next number as another number to apply in Euclidean lemma
Step 1: Since 121 > 2, we apply the division lemma to 121 and 2, to get
121 = 2 x 60 + 1
Step 2: Since the reminder 2 ≠ 0, we apply division lemma to 1 and 2, 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 2 and 121 is 1
Notice that 1 = HCF(2,1) = HCF(121,2) .
We can take hcf of as 1st numbers and next number as another number to apply in Euclidean lemma
Step 1: Since 642 > 1, we apply the division lemma to 642 and 1, to get
642 = 1 x 642 + 0
The remainder has now become zero, so our procedure stops. Since the divisor at this stage is 1, the HCF of 1 and 642 is 1
Notice that 1 = HCF(642,1) .
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Frequently Asked Questions on HCF of 40, 78, 121, 642 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 40, 78, 121, 642?
Answer: HCF of 40, 78, 121, 642 is 1 the largest number that divides all the numbers leaving a remainder zero.
3. How to find HCF of 40, 78, 121, 642 using Euclid's Algorithm?
Answer: For arbitrary numbers 40, 78, 121, 642 apply Euclid’s Division Lemma in succession until you obtain a remainder zero. HCF is the remainder in the last but one step.