## Lesson: Prime Factorization

Developing the Concept

Now that students can find the prime factorization for numbers that are familiar products, it is time for them to use their rules for divisibility to find the prime factorization of unfamiliar numbers.

**Wrap-Up and Assessment Hints**

Finding the prime factorization of numbers will strengthen your students' basic facts and understanding of multiplication. Students who do not know the basic multiplication facts well may struggle with this, because they do not recognize products such as 24 or 63 readily. Turning the problem around and giving students the prime factorization of a number and asking them what they know about the number without multiplying it out is a good way to assess their understanding of the divisibility rules, the concept of factor, and multiplication in general.