New Math Dictionary Sections: None
Upcoming Assessments: 5th WWU Quiz on Fri. 12/11/09
We continued our unit on Number Theory, which entails divisibility, prime and composite numbers, Greatest Common Factor (GCF), and Least Common Multiple (LCM). We continued adding to our math dictionary, finishing the notes on prime/composite. This led into our discussion and work on Prime Factorization and how it relates to GCF and LCM. With this, we reviewed the method they were taught in elementary school for finding GCF/LCM (listing the factors/multiples and comparing what they have in common). Students were also introduced to the "old school" method of using Factor Trees. They received a brief preview of this in the Eureka! play a few weeks ago, when the characters did trees for two numbers and used a Venn diagram to find the GCF and LCM. While some students may prefer using this method, most have chosen to use the "newer" Slide Method (AKA Upside Down Division) that was also taught. This method is usually much quicker and easier, allowing them to find both for two or more numbers all at once. The week was ended with a quiz on all of the Number Theory unit. GCF/LCM will carry over into next week when we begin adding and subtracting fractions.
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