Highest Common Factor of 20, 55, 91 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 20, 55, 91 i.e. 1 the largest integer that leaves a remainder zero for all numbers.
HCF of 20, 55, 91 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 20, 55, 91 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 20, 55, 91 is 1.
HCF(20, 55, 91) = 1
HCF of 20, 55, 91 using Euclid's algorithm
Highest common factor or Highest common divisor (hcd) can be calculated by Euclid's algotithm.
Highest common factor (HCF) of 20, 55, 91 is 1.
Highest Common Factor of 20,55,91 is 1
Step 1: Since 55 > 20, we apply the division lemma to 55 and 20, to get
55 = 20 x 2 + 15
Step 2: Since the reminder 20 ≠ 0, we apply division lemma to 15 and 20, to get
20 = 15 x 1 + 5
Step 3: We consider the new divisor 15 and the new remainder 5, and apply the division lemma to get
15 = 5 x 3 + 0
The remainder has now become zero, so our procedure stops. Since the divisor at this stage is 5, the HCF of 20 and 55 is 5
Notice that 5 = HCF(15,5) = HCF(20,15) = HCF(55,20) .
We can take hcf of as 1st numbers and next number as another number to apply in Euclidean lemma
Step 1: Since 91 > 5, we apply the division lemma to 91 and 5, to get
91 = 5 x 18 + 1
Step 2: Since the reminder 5 ≠ 0, we apply division lemma to 1 and 5, to get
5 = 1 x 5 + 0
The remainder has now become zero, so our procedure stops. Since the divisor at this stage is 1, the HCF of 5 and 91 is 1
Notice that 1 = HCF(5,1) = HCF(91,5) .
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Frequently Asked Questions on HCF of 20, 55, 91 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 20, 55, 91?
Answer: HCF of 20, 55, 91 is 1 the largest number that divides all the numbers leaving a remainder zero.
3. How to find HCF of 20, 55, 91 using Euclid's Algorithm?
Answer: For arbitrary numbers 20, 55, 91 apply Euclid’s Division Lemma in succession until you obtain a remainder zero. HCF is the remainder in the last but one step.