# Highest Common Factor of 490, 636, 686 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 490, 636, 686 i.e. 2 the largest integer that leaves a remainder zero for all numbers.

HCF of 490, 636, 686 is 2 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 490, 636, 686 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 490, 636, 686 is 2.

HCF(490, 636, 686) = 2

## HCF of 490, 636, 686 using Euclid's algorithm

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

HCF of:

Highest common factor (HCF) of 490, 636, 686 is 2. ### Highest Common Factor of 490,636,686 is 2

Step 1: Since 636 > 490, we apply the division lemma to 636 and 490, to get

636 = 490 x 1 + 146

Step 2: Since the reminder 490 ≠ 0, we apply division lemma to 146 and 490, to get

490 = 146 x 3 + 52

Step 3: We consider the new divisor 146 and the new remainder 52, and apply the division lemma to get

146 = 52 x 2 + 42

We consider the new divisor 52 and the new remainder 42,and apply the division lemma to get

52 = 42 x 1 + 10

We consider the new divisor 42 and the new remainder 10,and apply the division lemma to get

42 = 10 x 4 + 2

We consider the new divisor 10 and the new remainder 2,and apply the division lemma to get

10 = 2 x 5 + 0

The remainder has now become zero, so our procedure stops. Since the divisor at this stage is 2, the HCF of 490 and 636 is 2

Notice that 2 = HCF(10,2) = HCF(42,10) = HCF(52,42) = HCF(146,52) = HCF(490,146) = HCF(636,490) .

We can take hcf of as 1st numbers and next number as another number to apply in Euclidean lemma

Step 1: Since 686 > 2, we apply the division lemma to 686 and 2, to get

686 = 2 x 343 + 0

The remainder has now become zero, so our procedure stops. Since the divisor at this stage is 2, the HCF of 2 and 686 is 2

Notice that 2 = HCF(686,2) .

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### Frequently Asked Questions on HCF of 490, 636, 686 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 490, 636, 686?

Answer: HCF of 490, 636, 686 is 2 the largest number that divides all the numbers leaving a remainder zero.

3. How to find HCF of 490, 636, 686 using Euclid's Algorithm?

Answer: For arbitrary numbers 490, 636, 686 apply Euclid’s Division Lemma in succession until you obtain a remainder zero. HCF is the remainder in the last but one step.