Highest Common Factor of 21, 138, 515 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, 138, 515 i.e. 1 the largest integer that leaves a remainder zero for all numbers.
HCF of 21, 138, 515 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, 138, 515 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, 138, 515 is 1.
HCF(21, 138, 515) = 1
HCF of 21, 138, 515 using Euclid's algorithm
Highest common factor or Highest common divisor (hcd) can be calculated by Euclid's algotithm.
Highest common factor (HCF) of 21, 138, 515 is 1.
Highest Common Factor of 21,138,515 is 1
Step 1: Since 138 > 21, we apply the division lemma to 138 and 21, to get
138 = 21 x 6 + 12
Step 2: Since the reminder 21 ≠ 0, we apply division lemma to 12 and 21, to get
21 = 12 x 1 + 9
Step 3: We consider the new divisor 12 and the new remainder 9, and apply the division lemma to get
12 = 9 x 1 + 3
We consider the new divisor 9 and the new remainder 3, and apply the division lemma to get
9 = 3 x 3 + 0
The remainder has now become zero, so our procedure stops. Since the divisor at this stage is 3, the HCF of 21 and 138 is 3
Notice that 3 = HCF(9,3) = HCF(12,9) = HCF(21,12) = HCF(138,21) .
We can take hcf of as 1st numbers and next number as another number to apply in Euclidean lemma
Step 1: Since 515 > 3, we apply the division lemma to 515 and 3, to get
515 = 3 x 171 + 2
Step 2: Since the reminder 3 ≠ 0, we apply division lemma to 2 and 3, to get
3 = 2 x 1 + 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 3 and 515 is 1
Notice that 1 = HCF(2,1) = HCF(3,2) = HCF(515,3) .
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Frequently Asked Questions on HCF of 21, 138, 515 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, 138, 515?
Answer: HCF of 21, 138, 515 is 1 the largest number that divides all the numbers leaving a remainder zero.
3. How to find HCF of 21, 138, 515 using Euclid's Algorithm?
Answer: For arbitrary numbers 21, 138, 515 apply Euclid’s Division Lemma in succession until you obtain a remainder zero. HCF is the remainder in the last but one step.