Highest Common Factor of 30, 20, 78, 155 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 30, 20, 78, 155 i.e. 1 the largest integer that leaves a remainder zero for all numbers.
HCF of 30, 20, 78, 155 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 30, 20, 78, 155 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 30, 20, 78, 155 is 1.
HCF(30, 20, 78, 155) = 1
HCF of 30, 20, 78, 155 using Euclid's algorithm
Highest common factor or Highest common divisor (hcd) can be calculated by Euclid's algotithm.
Highest common factor (HCF) of 30, 20, 78, 155 is 1.
Highest Common Factor of 30,20,78,155 is 1
Step 1: Since 30 > 20, we apply the division lemma to 30 and 20, to get
30 = 20 x 1 + 10
Step 2: Since the reminder 20 ≠ 0, we apply division lemma to 10 and 20, to get
20 = 10 x 2 + 0
The remainder has now become zero, so our procedure stops. Since the divisor at this stage is 10, the HCF of 30 and 20 is 10
Notice that 10 = HCF(20,10) = HCF(30,20) .
We can take hcf of as 1st numbers and next number as another number to apply in Euclidean lemma
Step 1: Since 78 > 10, we apply the division lemma to 78 and 10, to get
78 = 10 x 7 + 8
Step 2: Since the reminder 10 ≠ 0, we apply division lemma to 8 and 10, to get
10 = 8 x 1 + 2
Step 3: We consider the new divisor 8 and the new remainder 2, and apply the division lemma to get
8 = 2 x 4 + 0
The remainder has now become zero, so our procedure stops. Since the divisor at this stage is 2, the HCF of 10 and 78 is 2
Notice that 2 = HCF(8,2) = HCF(10,8) = HCF(78,10) .
We can take hcf of as 1st numbers and next number as another number to apply in Euclidean lemma
Step 1: Since 155 > 2, we apply the division lemma to 155 and 2, to get
155 = 2 x 77 + 1
Step 2: Since the reminder 2 ≠ 0, we apply division lemma to 1 and 2, 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 2 and 155 is 1
Notice that 1 = HCF(2,1) = HCF(155,2) .
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Frequently Asked Questions on HCF of 30, 20, 78, 155 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 30, 20, 78, 155?
Answer: HCF of 30, 20, 78, 155 is 1 the largest number that divides all the numbers leaving a remainder zero.
3. How to find HCF of 30, 20, 78, 155 using Euclid's Algorithm?
Answer: For arbitrary numbers 30, 20, 78, 155 apply Euclid’s Division Lemma in succession until you obtain a remainder zero. HCF is the remainder in the last but one step.