Highest Common Factor of 21, 70, 91, 358 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 21, 70, 91, 358 i.e. 1 the largest integer that leaves a remainder zero for all numbers.

HCF of 21, 70, 91, 358 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 21, 70, 91, 358 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 21, 70, 91, 358 is 1.

HCF(21, 70, 91, 358) = 1

HCF of 21, 70, 91, 358 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 21, 70, 91, 358 is 1.

Highest Common Factor of 21,70,91,358 using Euclid's algorithm

Highest Common Factor of 21,70,91,358 is 1

Step 1: Since 70 > 21, we apply the division lemma to 70 and 21, to get

70 = 21 x 3 + 7

Step 2: Since the reminder 21 ≠ 0, we apply division lemma to 7 and 21, to get

21 = 7 x 3 + 0

The remainder has now become zero, so our procedure stops. Since the divisor at this stage is 7, the HCF of 21 and 70 is 7

Notice that 7 = HCF(21,7) = HCF(70,21) .


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

Step 1: Since 91 > 7, we apply the division lemma to 91 and 7, to get

91 = 7 x 13 + 0

The remainder has now become zero, so our procedure stops. Since the divisor at this stage is 7, the HCF of 7 and 91 is 7

Notice that 7 = HCF(91,7) .


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

Step 1: Since 358 > 7, we apply the division lemma to 358 and 7, to get

358 = 7 x 51 + 1

Step 2: Since the reminder 7 ≠ 0, we apply division lemma to 1 and 7, to get

7 = 1 x 7 + 0

The remainder has now become zero, so our procedure stops. Since the divisor at this stage is 1, the HCF of 7 and 358 is 1

Notice that 1 = HCF(7,1) = HCF(358,7) .

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Frequently Asked Questions on HCF of 21, 70, 91, 358 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 21, 70, 91, 358?

Answer: HCF of 21, 70, 91, 358 is 1 the largest number that divides all the numbers leaving a remainder zero.

3. How to find HCF of 21, 70, 91, 358 using Euclid's Algorithm?

Answer: For arbitrary numbers 21, 70, 91, 358 apply Euclid’s Division Lemma in succession until you obtain a remainder zero. HCF is the remainder in the last but one step.