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Example of finding GCF and LCM using factor lists.

A handwritten math example showing how to find the Greatest Common Factor (GCF) of 20 and 28, and the Least Common Multiple (LCM) of 9 and 12, with the numbers 4 and 36 circled as the answers.

A handwritten math example showing how to find the Greatest Common Factor (GCF) of 20 and 28, and the Least Common Multiple (LCM) of 9 and 12, with the numbers 4 and 36 circled as the answers.

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