Highest Common Factor of 47, 81 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 47, 81 i.e. 1 the largest integer that leaves a remainder zero for all numbers.

HCF of 47, 81 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 47, 81 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 47, 81 is 1.

HCF(47, 81) = 1

HCF of 47, 81 using Euclid's algorithm

Highest common factor or Highest common divisor (hcd) can be calculated by Euclid's algotithm.

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Highest common factor (HCF) of 47, 81 is 1.

Highest Common Factor of 47,81 using Euclid's algorithm

Highest Common Factor of 47,81 is 1

Step 1: Since 81 > 47, we apply the division lemma to 81 and 47, to get

81 = 47 x 1 + 34

Step 2: Since the reminder 47 ≠ 0, we apply division lemma to 34 and 47, to get

47 = 34 x 1 + 13

Step 3: We consider the new divisor 34 and the new remainder 13, and apply the division lemma to get

34 = 13 x 2 + 8

We consider the new divisor 13 and the new remainder 8,and apply the division lemma to get

13 = 8 x 1 + 5

We consider the new divisor 8 and the new remainder 5,and apply the division lemma to get

8 = 5 x 1 + 3

We consider the new divisor 5 and the new remainder 3,and apply the division lemma to get

5 = 3 x 1 + 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 47 and 81 is 1

Notice that 1 = HCF(2,1) = HCF(3,2) = HCF(5,3) = HCF(8,5) = HCF(13,8) = HCF(34,13) = HCF(47,34) = HCF(81,47) .

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Frequently Asked Questions on HCF of 47, 81 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 47, 81?

Answer: HCF of 47, 81 is 1 the largest number that divides all the numbers leaving a remainder zero.

3. How to find HCF of 47, 81 using Euclid's Algorithm?

Answer: For arbitrary numbers 47, 81 apply Euclid’s Division Lemma in succession until you obtain a remainder zero. HCF is the remainder in the last but one step.