Greatest Common Factor of 29 and 41 is 1

How to find the Greatest Common Factor of 29 and 41?

There are many methods we can apply to calculate the GCF of 29 and 41.


In our first method, we'll find out the prime factorisation of the 29 and 41 numbers.


In our second method, we'll create a list of all the factors of the 29 and 41 numbers.

These are the numbers that divide the 29 and 41 numbers without a remainder.

Once we have these, all we have to do is to find the one that is the biggest common number from the 2 lists.


Now let's look at each methods, and calculate the GCF of 29 and 41.

Methods of calculating the GCF of 29 and 41:

Method 1 - Prime Factorisation

With the prime factorisation method, all we have to do is to find the common prime factors of 29 and 41, and then multiply them. Really simple:

Step 1: Let's create a list of all the prime factors of 29 and 41:

Prime factors of 29:

As you can see below, the prime factors of 29 are 29.

Let's illustrate the prime factorization of 29 in exponential form:

29 = 291

Prime factors of 41:

As you can see below, the prime factors of 41 are 41.

Let's illustrate the prime factorization of 41 in exponential form:

41 = 411


Step 2: Write down a list of all the common prime factors of 29 and 41:

As seen in the boxes above, the common prime factors of 29 and 41 are 1.


Step 3: All we have to do now is to multiply these common prime factors:

Find the product of all common prime factors by multiplying them:

11=1

Done!

According to our calculations above, the Greatest Common Factor of 29 and 41 is 1

Method 2 - List of Factors

With this simple method, we'll need to find all the factors of 29 and 41, factors are numbers that divide the another number without a remainder, and simply identify the common ones, then choose which is the largest one.


Step 1: Create a list of all the numbers that divide 29 and 41 without a remainder:

List of factors that divide 29 without a remainder are:

1 and 29.

List of factors that divide 41 without a remainder are:

1 and 41.


Step 2: Identify the largest common number from the 2 lists above:

As you can see in the lists of factors from above, for the numbers 29 and 41, we have highlighted the number 1, which means that we have found the Greatest Common Factor, or GCF.

According to our calculations above, the Greatest Common Factor of 29 and 41 is 1

Method 3 - Euclidean algorithm

The Euclidean algorithm says that if number k is the GCM of 29 and 41, then the number k is also the GCM of the division remainder of the numbers 29 and 41.

We follow this procedure until the reminder is 0.

The Greatest Common Divisor is the last nonzero number.


Step 1: Sort the numbers into ascending order:

29, 41

Step 2

Take out, from the set, the smallers number as you divisor: 29

The remaining set is: 41

Find the reminder of the division between the number and the divisor

41 mod 29 = 12


Gather the divisor and all of the remainders and sort them in ascending order. Remove any duplicates and 0. Our set is:

12, 29

Repeat the process until there is only one number in the set.

Take out, from the set, the smallers number as you divisor: 12

The remaining set is: 29

Find the reminder of the division between the number and the divisor

29 mod 12 = 5


Gather the divisor and all of the remainders and sort them in ascending order. Remove any duplicates and 0. Our set is:

5, 12

Repeat the process until there is only one number in the set.

Take out, from the set, the smallers number as you divisor: 5

The remaining set is: 12

Find the reminder of the division between the number and the divisor

12 mod 5 = 2


Gather the divisor and all of the remainders and sort them in ascending order. Remove any duplicates and 0. Our set is:

2, 5

Repeat the process until there is only one number in the set.

Take out, from the set, the smallers number as you divisor: 2

The remaining set is: 5

Find the reminder of the division between the number and the divisor

5 mod 2 = 1


Gather the divisor and all of the remainders and sort them in ascending order. Remove any duplicates and 0. Our set is:

1, 2

Repeat the process until there is only one number in the set.

Take out, from the set, the smallers number as you divisor: 1

The remaining set is: 2

Find the reminder of the division between the number and the divisor

2 mod 1 = 0


Gather the divisor and all of the remainders and sort them in ascending order. Remove any duplicates and 0. Our set is:

1

Step 3: Take the remaining number from our set

The Greatest Common Factor of 29 and 41 is 1

Method 4 - Binary Greatest Common Divisor algorithm

The binary GCD algorithm, also known as Stein's algorithm or the binary Euclidean algorithm, is an algorithm that computes the greatest common divisor of two nonnegative integers. Stein's algorithm uses simpler arithmetic operations than the conventional Euclidean algorithm; it replaces division with arithmetic shifts, comparisons, and subtraction.

Although the algorithm in its contemporary form was first published by the Israeli physicist and programmer Josef Stein in 1967, it may have been known by the 2nd century BCE, in ancient China.

Step 1: Sort the numbers, and set initial GCF equal to 1

The list: 29, 41

Step 2: Pick the first number, 29.
Subtract 29 from the remaining value(s) and divide the outcome by 2.
Remove the duplicates and sort:

(41-29)/2 = 6

The resulting list: 6, 29

Step 3: Divide all of the remaining even values by 2, remove the duplicates and sort.
Repeat the process if there are even numbers in the list:

6/2 = 3

The resulting list: 3, 29

Step 4: Pick the first number, 3.
Subtract 3 from the remaining value(s) and divide the outcome by 2.
Remove the duplicates and sort:

(29-3)/2 = 13

The resulting list: 3, 13

Step 5: Pick the first number, 3.
Subtract 3 from the remaining value(s) and divide the outcome by 2.
Remove the duplicates and sort:

(13-3)/2 = 5

The resulting list: 3, 5

Step 6: Pick the first number, 3.
Subtract 3 from the remaining value(s) and divide the outcome by 2.
Remove the duplicates and sort:

(5-3)/2 = 1

The resulting list: 1, 3

Step 7: Pick the first number, 1.
Subtract 1 from the remaining value(s) and divide the outcome by 2.
Remove the duplicates and sort:

(3-1)/2 = 1

The resulting list: 1

Step 8: Only one number remains, 1.
Multiply it by your current GCF:

GCF = 1*1 = 1

The Greatest Common Factor of 29 and 41 is 1