This document provides a lesson on factor trees, prime factorization, greatest common factors (GCF), and using the distributive property to write sums as products. It includes examples and practice problems for students to work through. For factor trees and prime factorization, students find the prime factors of numbers like 36, 28, 45, and 72. For GCF, they use factor trees to find the GCF of pairs of numbers and complete Venn diagrams. Finally, for the distributive property, students write sums as products where the GCF is a factor and the remaining numbers form the sum, such as 24 + 16 = 4(6 + 4). The document ends with homework practice applying these concepts.