**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