# Highest Common Factor of 15, 35, 42, 68 using Euclid's algorithm

HCF Calculator using the Euclid Division Algorithm helps you to find the Highest common factor (HCF) easily for 15, 35, 42, 68 i.e. 1 the largest integer that leaves a remainder zero for all numbers.

HCF of 15, 35, 42, 68 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 15, 35, 42, 68 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 15, 35, 42, 68 is 1.

HCF(15, 35, 42, 68) = 1

## HCF of 15, 35, 42, 68 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 15, 35, 42, 68 is 1.

### Highest Common Factor of 15,35,42,68 using Euclid's algorithm

Step 1: Since 35 > 15, we apply the division lemma to 35 and 15, to get

35 = 15 x 2 + 5

Step 2: Since the reminder 15 ≠ 0, we apply division lemma to 5 and 15, 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 15 and 35 is 5

Notice that 5 = HCF(15,5) = HCF(35,15) .

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

Step 1: Since 42 > 5, we apply the division lemma to 42 and 5, to get

42 = 5 x 8 + 2

Step 2: Since the reminder 5 ≠ 0, we apply division lemma to 2 and 5, to get

5 = 2 x 2 + 1

Step 3: 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 5 and 42 is 1

Notice that 1 = HCF(2,1) = HCF(5,2) = HCF(42,5) .

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

Step 1: Since 68 > 1, we apply the division lemma to 68 and 1, to get

68 = 1 x 68 + 0

The remainder has now become zero, so our procedure stops. Since the divisor at this stage is 1, the HCF of 1 and 68 is 1

Notice that 1 = HCF(68,1) .

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### Frequently Asked Questions on HCF of 15, 35, 42, 68 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 15, 35, 42, 68?

Answer: HCF of 15, 35, 42, 68 is 1 the largest number that divides all the numbers leaving a remainder zero.

3. How to find HCF of 15, 35, 42, 68 using Euclid's Algorithm?

Answer: For arbitrary numbers 15, 35, 42, 68 apply Euclid’s Division Lemma in succession until you obtain a remainder zero. HCF is the remainder in the last but one step.