Question

What is the greatest common factor of 15 and 30?

Answer 1

HCF of 15 and 30 is 15.
So 15 is the greatest common factor between 15 and 30.

Answer 2

The greatest common factor of 15 and 30 = 15  

Given:

15 and 30

To find:

The greatest common factor of 15 and 30

Solution:

Greatest common factor or GCF

• GCF is also called as HCF or Highest common factor  
• Greatest common factor of two or more number is a largest number which divides each of the given two or more numbers.
• It is also called the Greatest Common Divisor or GCD

To find the greatest common factor of 15 and 30 write them as product of  their prime factors

15 = 3 × 5

30 = 2 × 3 × 5  

GCF (15, 30) = 3 × 5  [ Common in both factors ]

GCF (15, 30) = 15

Therefore, greatest common factor of 15 and 30 = 15  

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