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GCF of 28 and 60

GCF of 28 and 60 is the largest possible number that divides 28 and 60 exactly without any remainder. The factors of 28 and 60 are 1, 2, 4, 7, 14, 28 and 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60 respectively. There are 3 commonly used methods to find the GCF of 28 and 60 - Euclidean algorithm, long division, and prime factorization.

1.	GCF of 28 and 60
2.	List of Methods
3.	Solved Examples
4.	FAQs

What is GCF of 28 and 60?

Answer: GCF of 28 and 60 is 4.

Explanation:

The GCF of two non-zero integers, x(28) and y(60), is the greatest positive integer m(4) that divides both x(28) and y(60) without any remainder.

Methods to Find GCF of 28 and 60

The methods to find the GCF of 28 and 60 are explained below.

Using Euclid's Algorithm
Long Division Method
Prime Factorization Method

GCF of 28 and 60 by Euclidean Algorithm

As per the Euclidean Algorithm, GCF(X, Y) = GCF(Y, X mod Y)
where X > Y and mod is the modulo operator.

Here X = 60 and Y = 28

GCF(60, 28) = GCF(28, 60 mod 28) = GCF(28, 4)
GCF(28, 4) = GCF(4, 28 mod 4) = GCF(4, 0)
GCF(4, 0) = 4 (∵ GCF(X, 0) = |X|, where X ≠ 0)

Therefore, the value of GCF of 28 and 60 is 4.

GCF of 28 and 60 by Long Division

GCF of 28 and 60 is the divisor that we get when the remainder becomes 0 after doing long division repeatedly.

Step 1: Divide 60 (larger number) by 28 (smaller number).
Step 2: Since the remainder ≠ 0, we will divide the divisor of step 1 (28) by the remainder (4).
Step 3: Repeat this process until the remainder = 0.

The corresponding divisor (4) is the GCF of 28 and 60.

GCF of 28 and 60 by Prime Factorization

Prime factorization of 28 and 60 is (2 × 2 × 7) and (2 × 2 × 3 × 5) respectively. As visible, 28 and 60 have common prime factors. Hence, the GCF of 28 and 60 is 2 × 2 = 4.

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GCF of 28 and 60 Examples

Example 1: Find the GCF of 28 and 60, if their LCM is 420.

Solution:

∵ LCM × GCF = 28 × 60
⇒ GCF(28, 60) = (28 × 60)/420 = 4
Therefore, the greatest common factor of 28 and 60 is 4.
Example 2: For two numbers, GCF = 4 and LCM = 420. If one number is 60, find the other number.

Solution:

Given: GCF (z, 60) = 4 and LCM (z, 60) = 420
∵ GCF × LCM = 60 × (z)
⇒ z = (GCF × LCM)/60
⇒ z = (4 × 420)/60
⇒ z = 28
Therefore, the other number is 28.
Example 3: Find the greatest number that divides 28 and 60 exactly.

Solution:

The greatest number that divides 28 and 60 exactly is their greatest common factor, i.e. GCF of 28 and 60.
⇒ Factors of 28 and 60:
- Factors of 28 = 1, 2, 4, 7, 14, 28
- Factors of 60 = 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60
Therefore, the GCF of 28 and 60 is 4.

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FAQs on GCF of 28 and 60

What is the GCF of 28 and 60?

The GCF of 28 and 60 is 4. To calculate the greatest common factor (GCF) of 28 and 60, we need to factor each number (factors of 28 = 1, 2, 4, 7, 14, 28; factors of 60 = 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60) and choose the greatest factor that exactly divides both 28 and 60, i.e., 4.

How to Find the GCF of 28 and 60 by Prime Factorization?

To find the GCF of 28 and 60, we will find the prime factorization of the given numbers, i.e. 28 = 2 × 2 × 7; 60 = 2 × 2 × 3 × 5.
⇒ Since 2, 2 are common terms in the prime factorization of 28 and 60. Hence, GCF(28, 60) = 2 × 2 = 4
☛ What is a Prime Number?

How to Find the GCF of 28 and 60 by Long Division Method?

To find the GCF of 28, 60 using long division method, 60 is divided by 28. The corresponding divisor (4) when remainder equals 0 is taken as GCF.

If the GCF of 60 and 28 is 4, Find its LCM.

GCF(60, 28) × LCM(60, 28) = 60 × 28
Since the GCF of 60 and 28 = 4
⇒ 4 × LCM(60, 28) = 1680
Therefore, LCM = 420
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What are the Methods to Find GCF of 28 and 60?

There are three commonly used methods to find the GCF of 28 and 60.

By Prime Factorization
By Long Division
By Euclidean Algorithm

What is the Relation Between LCM and GCF of 28, 60?

The following equation can be used to express the relation between LCM (Least Common Multiple) and GCF of 28 and 60, i.e. GCF × LCM = 28 × 60.

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