Highest Common Factor of 68, 85, 42 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 68, 85, 42 i.e. 1 the largest integer that leaves a remainder zero for all numbers.
HCF of 68, 85, 42 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 68, 85, 42 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 68, 85, 42 is 1.
HCF(68, 85, 42) = 1
HCF of 68, 85, 42 using Euclid's algorithm
Highest common factor or Highest common divisor (hcd) can be calculated by Euclid's algotithm.
Highest common factor (HCF) of 68, 85, 42 is 1.
Highest Common Factor of 68,85,42 is 1
Step 1: Since 85 > 68, we apply the division lemma to 85 and 68, to get
85 = 68 x 1 + 17
Step 2: Since the reminder 68 ≠ 0, we apply division lemma to 17 and 68, to get
68 = 17 x 4 + 0
The remainder has now become zero, so our procedure stops. Since the divisor at this stage is 17, the HCF of 68 and 85 is 17
Notice that 17 = HCF(68,17) = HCF(85,68) .
We can take hcf of as 1st numbers and next number as another number to apply in Euclidean lemma
Step 1: Since 42 > 17, we apply the division lemma to 42 and 17, to get
42 = 17 x 2 + 8
Step 2: Since the reminder 17 ≠ 0, we apply division lemma to 8 and 17, to get
17 = 8 x 2 + 1
Step 3: We consider the new divisor 8 and the new remainder 1, and apply the division lemma to get
8 = 1 x 8 + 0
The remainder has now become zero, so our procedure stops. Since the divisor at this stage is 1, the HCF of 17 and 42 is 1
Notice that 1 = HCF(8,1) = HCF(17,8) = HCF(42,17) .
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Frequently Asked Questions on HCF of 68, 85, 42 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 68, 85, 42?
Answer: HCF of 68, 85, 42 is 1 the largest number that divides all the numbers leaving a remainder zero.
3. How to find HCF of 68, 85, 42 using Euclid's Algorithm?
Answer: For arbitrary numbers 68, 85, 42 apply Euclid’s Division Lemma in succession until you obtain a remainder zero. HCF is the remainder in the last but one step.