1. Factors, Multiples, Primes, and Composites Mr. Paul Dittamo

2. These are the numbers that can be multiplied to get 21
Factors
Factors are numbers that can be multiplied together to achieve a product.
These are the numbers that can be multiplied to get 21
Examples:
Factors of 21 are: 3, 7, 21, and 1
Factors of 30 are: 3, 10, 5, 6, 15, 2, 30, 1
Factors of 12 are: 3, 4, 6, 2, 12, 1

3. You Try!!! What are the factors of 20? 4, 5, 10, 2, 20, 1
8, 4, 16, 2, 32, 1
What are the factors of 18?
6, 3, 9, 2, 18, 1
CHALLENGE: What are the factors of 72?
9, 8, 36, 2, 18, 4, 12, 6, 72, 1

4. All you need to do is skip count by the number to get its multiples
A multiple of a number is the product of that number and any whole number
All you need to do is skip count by the number to get its multiples
Examples:
Multiples of 2 are: 2, 4, 6, 8, 10, 12
Multiples of 5 are: 5, 10, 15, 20, 25
Multiples of 7 are: 7, 14, 21, 28, 35

5. You Try!!! What are the multiples of 3? 3, 6, 9, 12, 15, 18, 21, 24
6, 12, 18, 24, 30, 36, 42
What are the multiples of 9?
9, 18, 27, 36, 45, 54, 63
CHALLENGE: What are the factors of 12?
12, 24, 36, 48, 60, 72, 84, 96

6. Prime Numbers
Prime numbers are whole numbers with exactle two factors, 1 and itself!
Examples:
2 is a prime number, because the only two numbers you can multiply to get 2 are:
2 and 1
7 is a prime number, because the only two numbers you can multiply to get 2 are:
7 and 1

7. You Try!!! No, because its factors are 2, 6, 3, 4, 12, and 1
Is 12 a prime number?
Yes, because its factors are only 11 and 1
Is 11 a prime number?
Yes, because its factors are only 23 and 1
Is 23 a prime number?
No, because its factors are 2, 7, 14, and 1
Is 14 a prime number?

8. Composite
Composite numbers are the opposite of prime numbers. They are whole numbers with more than two factors.
Examples:
8 is a composite number, because it has more than two factors: 2, 4, 8, and 1
10 is a composite number, because it has more than two factors: 2, 5, 10, and 1
16 is a composite number, because it has more than two factors: 8, 2, 4, 16, and 1

9. You Try!!!
Yes, because it has more than two factors: 9, 2, 6, 3, 18, and 1
Is 18 a composite number?
Is 13 a composite number?
No, because it has only two factors: 13 and 1
Is 20 a composite number?
Yes, because it has more than two factors: 4, 5, 10, 2, 20, and 1
No, because it has only two factors: 3 and 1
Is 3 a composite number?