Pre-Algebra Examples

Find the GCF 18 , 42
,
Step 1
Find the common factors for the numerical part:
Step 2
The factors for are .
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Step 2.1
The factors for are all numbers between and , which divide evenly.
Check numbers between and
Step 2.2
Find the factor pairs of where .
Step 2.3
List the factors for .
Step 3
The factors for are .
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Step 3.1
The factors for are all numbers between and , which divide evenly.
Check numbers between and
Step 3.2
Find the factor pairs of where .
Step 3.3
List the factors for .
Step 4
List all the factors for to find the common factors.
:
:
Step 5
The common factors for are .
Step 6
The GCF (HCF) of the numerical factors is .