This document appears to be notes from a math class on finding the greatest common factor (GCF). It includes examples of finding the prime factorizations of numbers and using them to determine the GCF of pairs of numbers or expressions. The homework assigned is problems 17-24 and 29-41 on page 189, and an answer key to the worksheet is provided on the last page.

1. 4.3 GCF October 28, 2011
List the factors of Bellwork
1. 36
2. 4
3. 126
Objective ­ find and use prime factorizations
HW pg. 189 #17­24, 29­41 1

2. 4.3 GCF October 28, 2011
Write the prime factorization of each number.
72 121
HW pg. 189 #17­24, 29­41 2

3. 4.3 GCF October 28, 2011
Greatest Common Factor (GCF):
Find the GCF of each pair of numbers or expressions.
40 and 60 6a3b and 4a2b
HW pg. 189 #17­24, 29­41 3

4. 4.3 GCF October 28, 2011
Use the prime factorization to find each GCF.
12, 87 What do these numbers divide by? How do we know?
HW pg. 189 #17­24, 29­41 4

5. 4.3 GCF October 28, 2011
Find the GCF.
15m2n, 45m
HW pg. 189 #17­24, 29­41 5

6. 4.3 GCF October 28, 2011
HW pg. 189 #17­24, 29­41
HW pg. 189 #17­24, 29­41 6

7. 4.3 GCF October 28, 2011
Answer key to worksheet.
HW pg. 189 #17­24, 29­41 7