$\frac{20}{5}$

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Examples

Find the Greatest Common Factor (GCF) of

20,5

Method 1: By Listing Factors

List the factors of each number.

Factors of 20

: 1, 2, 4, 5, 10, 20

Factors of 5

: 1, 5

Find the largest number that is shared by all rows above. This is the GCF.

GCF =

5

Method 2: By Prime Factors

List the prime factors of each number.

Prime Factors of 20

: 2, 2, 5

Prime Factors of 5

: 5

Find the intersection of these primes.

5

The intersection contains only one number. Therefore, this is the GCF.

GCF =

5

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5

Divide both the numerator and the denominator by the GCF.

\frac{20\div 5}{5\div 5}

Simplify.

4

Done

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205\frac{20}{5}520​