# Factors and Multiples ```August 27, 2010
1) HW for tonight: “Bumpin’ into Factors”
worksheet
3) Put your name on the back of your time test and
leave face down.
4) Set up your paper to Warm-Up #5
Warm-Up #5
Identify each number as prime or composite and tell
how you know. List all the rules it fits.
prime because it is divisible by 1________.
&amp; 19 ONLY
1. 19 is _______
3
2. 57 is composite
_______ because it is divisible by ________.
3, 4, 6
3. 852 is _______
composite because it is divisible by 2,
_______.
Factors and Multiples
Number Theory GONE WILD!
Factors “Fit” into Families
Multiples Multiply like Rabbits!
What am I Learning Today?
Factors
How will I show that I learned it?
Calculate the factors of a given number using the list
method
Use the divisibility rules to help find factors
Use factors to determine whether or not numbers are
prime or composite
Vocabulary
Factor: Whole numbers that are multiplied to
find a product.
Product: The answer to a multiplication problem
What is a factor?
Whole numbers that are multiplied
to create a product.
Remember: A product is the result of two numbers multiplied together.
2 3 = 6
Factors
1
Product
6 = 6
What types of numbers are factors?
Both prime and composite, including one.
What do all factors have in common?
A factor of one since one multiplied by any
number equals that number.
How do I find factors using the list method?
1) Use the divisibility rules to list the numbers that evenly
divide into that number
2) Each factor must have a partner (BFF) in order to create
a factor pair
List all factors of 12. Begin listing factors in pairs.
12 = 1 • 12
12 = 2 • 6
12 = 3 • 4
1
2
3
4
1 and 12 are factors.
2 and 6 are factors.
3 and 4 are factors.
6 12
You can draw a diagram to
illustrate the factor pairs.
The factors of 12 are 1, 2, 3, 4, 6, and 12
What are the factors of 36?
factor pairs
36 = 1 • 36
36 = 2 • 18
36 = 3 • 12
36 = 4 • 9
1 and 36 are factors.
2 and 18 are factors.
3 and 12 are factors.
4 and 9 are factors.
5 is not a factor.
36 = 6 • 6
6 is a factor.
The factors of 36 are 1, 2, 3, 4, 6, 9, 12, 18, 36
Why is “6” only listed once?
Roll Those Factors
• Roll the dice, form a
two digit number, and
record it
• List all the factors of the
number rolled and
count the total