Grade 4 Unit of Study 5: Prime and Composite Numbers

Click here for the Spanish version: https://youtu.be/xl_Iqwq5JQ8

In This Unit of Study…

Students utilize their knowledge of fact fluency and how rectangular arrays represent multiplication to identify all factor pairs for a given number up to 144. Students use the amount of factor pairs to determine if the number is prime or composite.

B.E.S.T. Benchmarks:

• MA.4.AR.3.1 Determine factor pairs for a whole number from 0 to 144. Determine whether a whole number from 0 to 144 is prime, composite or neither.
• MA.4.NSO.2.1 Recall multiplication facts with factors up to 12 and related division facts with automaticity. 

Overarching Key Concepts:

• Fluency: Multiply by 6
• Represent and determine factor pairs within 144
• Identify and describe prime and composite numbers within 144