August 27, 2010
1) HW for tonight: “Bumpin’ into Factors”
worksheet
2) Open your agenda to your behavior card
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________.
& 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?
Hint: Use the divisibility rules to help you find the
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
• Tally your score
• Take turns and make
sure you check your
partner’s factors for
accuracy