\[\frac{32}{80}\]

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Examples

Find the Greatest Common Factor (GCF) of

32,80

Method 1: By Listing Factors

List the factors of each number.

Factors of 32

: 1, 2, 4, 8, 16, 32

Factors of 80

: 1, 2, 4, 5, 8, 10, 16, 20, 40, 80

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

GCF =

16

Method 2: By Prime Factors

List the prime factors of each number.

Prime Factors of 32

: 2, 2, 2, 2, 2

Prime Factors of 80

: 2, 2, 2, 2, 5

Find the intersection of these primes.

2,2,2,2

Multiply these numbers:

2\times 2\times 2\times 2=16

. This is the GCF.

GCF =

16

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16

Divide both the numerator and the denominator by the GCF.

\frac{32\div 16}{80\div 16}

Simplify.

\frac{2}{5}

Done

Decimal Form: 0.4

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