The greatest common factor of 63 and 84 is 21. The highest number that is a factor of all the numbers is known as the greatest common factor of two or more numbers.
The largest factor that splits both numbers is said to be the greatest common factor. List the prime factors of each integer before calculating the greatest common factor.
To calculate the greatest common factor, break the numbers up into their prime factors:
63 = 3 × 3 × 7
84 = 2 × 2 × 3 × 7
Then, multiply all the numbers that seem twice to acquire the Highest common factor (HCF)
HCF = 3 × 7
= 21
Learn more about the greatest common factor, here:
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