216 Multifaceted Number Concepts
Successful Strategies
As with fi nding the LCM, a benefi cial way to help students
fi nd the GCF is to have students show the factors of each
number in a skip counting pattern. When students examine
these patterns it is easier to fi nd the common factors and the
GCF. Students may show the factors with numbers, words,
or models. The hundred chart serves as a valuable tool in
helping students to fi nd common and greatest common
factors.greatest, common,
factor, patternMath Words to Use
Questions at Different Levels of Cognitive Demand
Recall: What is a factor of 10?
Comprehension: Which examples could you give for
the common factors of 10 and 8?
Application: How would you show the order of
common factors?
Analysis: How would you compare the GCFs for two
pairs of numbers?
Evaluation: What strategy do you recommend for
fi nding the GCF?
Synthesis: What if we needed to fi nd the GCF of four
numbers?EASYCOMPLEX