Factors & Multiples

Why learn Greatest Common Factor

Why are we learning Greatest Common Factor (GCF)?

It is important for educators to recognize that teaching the various procedures for finding GCF and LCM is not a standalone topic, but rather a foundation skill required for more advanced applications a few years down the road. More importantly, for higher grade teachers, when dealing with students with anxiety over algebraic manipulations and fractions operations, to identify if procedural fluency of finding GCF and LCM might be the root cause.

Finding Greatest Common Factor by Prime Factorization

We received a question regarding the 2nd method of finding Greatest Common Factor by Prime Factorization in the Math In Focus Grade 4 materials. This example is from Math In Focus workbook 4A page 23, The “Method 2” mentioned above uses prime factorization as a procedure to find the GCF between two numbers. Procedure In each …

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