Here's a simple observation to get you started. If you notice that both numbers are even, then divide by 2. This will give you 3 and 12 left over here. Noy you cant divide both by 2, so let's try 3. Success, leaving you with 1 and 4 respectively. So now you divided by a 2 and a 3, so multiply these to get your GCF, i.e. 2x3 is 6
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