Finding Factors and Multiples

This lesson unit is intended to help you to assess how well students are able to understand the meanings of the terms ‘Greatest Common Factor’ (GCF) and ‘Least Common Multiple’ (LCM). In particular, the lesson will help you to identify and help students who:

• Confuse GCFs and LCMs.
• Lack a sense of what values of GCF or LCM might be reasonable for a given pair of numbers.