1. Factors, Primes & Composite Numbers

2. Learning Objective: Today factor numbers and determine if they are prime or composite.
State objective
Teach the meaning it literary works
Literary works refers to literature
Have students repeat literature

3. What will we learn today?
Today we will factor numbers and determine if they are prime or composite.
Have students share with partners the objective then call on 3 non volunteer to share today’s objective

4. What is the answer to a multiplication problem called?
Partner Share
What is 3 x 7?
What is the answer to a multiplication problem called?

5. Definition Product Product – An answer to a multiplication problem.
7 x 8 = 56
Product

6. Definition
Factor – a number that is multiplied by another to give a product.
7 x 8 = 56
Factors

7. What are the factors? (What two numbers make that product?)
6 x 7 = 42
6 & 7
7 x 9 = 63
7 & 9
8 x 6 = 48
8 & 6
4 & 9
4 x 9 = 36

8. 7 Definition 7 is prime because the only numbers
Prime Number – a number that has only two factors, itself and 1. 7
7 is prime because the only numbers
that will divide into it evenly are 1 and 7.

9. Examples of Prime Numbers
2, 3, 5, 7, 11, 13, 17, 19
Special Note:
One is not a prime number.

10. The factors of 8 are 1, 2, 4, 8 because 1x8=8 and 2x4=8
Definition
Composite number – a number that has more than two factors. 8
The factors of 8 are 1, 2, 4, 8 because 1x8=8 and 2x4=8

11. Examples of Composite Numbers
4, 6, 8, 9, 10, 12, 14, 15
Special Note:
Every whole number from 2 on is
either composite or prime.

12. Our Lonely 1 One is not a prime nor a composite number.
It is not prime
because it does
not have exactly
two different
factors.
It is not
composite
because it does
not have more
than 2 factors.
Special Note:
One is not a prime nor
a composite number.

13. Why is it important to understand?

14. How to use a factor tree Step 1 – Write down two factors.48
Step 1 – Write down two factors.
(What two numbers make 48?) 48 6 8 48

15. How to use a factor tree
Step 2 – Find factors of these numbers until
all factors are prime.
(what makes a 6? What makes an 8?) 48 6 2 3 8 4 48 6 2 3 8 48 6 8 48

16. How to use a factor tree Step 2 – Find factors of these numbers
until all factors are prime numbers. 48 6 2 3 8 4 48 6 2 3 8 4

17. Composite How to use a Factor Tree Factors of 48 are: 1,2,3,4,6,8,48
Step 3 – Write the numbers from least
to greatest.
Determine if the number is prime or composite. 48 6 2 3 8 4
Factors of 48 are:
1,2,3,4,6,8,48
Hint: only write each digit once.
Composite

18. Composite Factors of 6 are: Factor this number 1,2,4,6
Step 1 – Write down two factors.
Step 2 – Find factors of these numbers until all factors are prime
Step 3 – Write the numbers from least to greatest.
Determine if the number is prime or composite.
Factor this number
Composite 6 2 3
Factors of 6 are:
Hint: only write each digit once. 6
1,2,4,6

19. Composite Factors of 8 are: Factor this number 1,2,4,8 8
Step 1 – Write down two factors.
Step 2 – Find factors of these numbers until all factors are prime
Step 3 – Write the numbers from least to greatest.
Determine if the number is prime or composite.
Factor this number 8 2 4
Composite 8 2 4
Factors of 8 are:
Hint: only write each digit once. 8
1,2,4,8

20. Composite Factors of 6 are: Factor this number 1,2,5,10
Hint: only write each digit once. 10
1,2,5,10

21. Composite Factors of 8 are: Factor this number 1,2,4,5,20 20
Hint: only write each digit once. 20
1,2,4,5,20

22. Prime Factors of 7 are: 1,7 Factor this number
Hint: only write each digit once.

23. Prime Factors of 13 are: 1,13 Factor this number
Hint: only write each digit once. 13

24. Now you try! Factor this number
What did we learn to factor today?
Why is it important?
Now you try! Factor this number
Prime or composite?
Factors of ___ are:
_____________
Hint: only write each digit once. Don’t forget 1 and itself! 25

25. Now you try! Factor this number
Prime or composite?
Factors of ___ are:
_____________
Hint: only write each digit once. Don’t forget 1 and itself! 24

26. Now you try! Factor this number
Prime or composite?
Factors of ___ are:
_____________
Hint: only write each digit once. Don’t forget 1 and itself! 17

27. Factor this number Prime or composite? Factors of __________ are:
Step 1 – Write down two factors.
Step 2 – Find factors of these numbers until all factors are prime
Step 3 – Write the numbers from least to greatest.
Determine if the number is prime or composite.
Prime or composite?
Factors of __________ are:
Hint: only write each digit once. Don’t forget 1 and itself!
Factor this number
Print this slide for use in whiteboards