Highest Common Factor of 256, 391 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 256, 391 i.e. 1 the largest integer that leaves a remainder zero for all numbers.

HCF of 256, 391 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 256, 391 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 256, 391 is 1.

HCF(256, 391) = 1

HCF of 256, 391 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 256, 391 is 1.

Highest Common Factor of 256,391 using Euclid's algorithm

Highest Common Factor of 256,391 is 1

Step 1: Since 391 > 256, we apply the division lemma to 391 and 256, to get

391 = 256 x 1 + 135

Step 2: Since the reminder 256 ≠ 0, we apply division lemma to 135 and 256, to get

256 = 135 x 1 + 121

Step 3: We consider the new divisor 135 and the new remainder 121, and apply the division lemma to get

135 = 121 x 1 + 14

We consider the new divisor 121 and the new remainder 14,and apply the division lemma to get

121 = 14 x 8 + 9

We consider the new divisor 14 and the new remainder 9,and apply the division lemma to get

14 = 9 x 1 + 5

We consider the new divisor 9 and the new remainder 5,and apply the division lemma to get

9 = 5 x 1 + 4

We consider the new divisor 5 and the new remainder 4,and apply the division lemma to get

5 = 4 x 1 + 1

We consider the new divisor 4 and the new remainder 1,and apply the division lemma to get

4 = 1 x 4 + 0

The remainder has now become zero, so our procedure stops. Since the divisor at this stage is 1, the HCF of 256 and 391 is 1

Notice that 1 = HCF(4,1) = HCF(5,4) = HCF(9,5) = HCF(14,9) = HCF(121,14) = HCF(135,121) = HCF(256,135) = HCF(391,256) .

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Frequently Asked Questions on HCF of 256, 391 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 256, 391?

Answer: HCF of 256, 391 is 1 the largest number that divides all the numbers leaving a remainder zero.

3. How to find HCF of 256, 391 using Euclid's Algorithm?

Answer: For arbitrary numbers 256, 391 apply Euclid’s Division Lemma in succession until you obtain a remainder zero. HCF is the remainder in the last but one step.