Transcript Factors, Multiples, Primes, and Composites Model & Guided Practice By Teachers Unleashed Factors Factors are numbers that can be multiplied together to achieve a product. Examples: Factors.

Factors, Multiples, Primes,
and Composites
Model & Guided Practice
By Teachers Unleashed
Factors
Factors are numbers that can be multiplied
together to achieve a product.
Examples:
Factors of 21 are: 3, 7, 21, and 1
Written in number order: 1, 3, 7, 21
Factors of 30 are: 3, 10, 5, 6, 15, 2, 30, 1
Written in number order: 1, 2, 3, 5, 6, 10, 15, 30
Factors of 12 are: 3, 4, 6, 2, 12, 1
Written in number order: 1, 2, 3, 4, 6, 12
These are the
numbers that
can be
multiplied to get
21
You Try!!!
What are the factors of 20? 4, 5, 10, 2, 20, 1
In order: 1, 2, 4, 5, 10, 20
What are the factors of 32? 8, 4, 16, 2, 32, 1
In order: 1, 2, 4, 8, 16, 32
What are the factors of 18? 6, 3, 9, 2, 18, 1
In order: 1, 2, 3, 6, 9, 18
CHALLENGE: What are the factors of 72?
9, 8, 36, 2, 24, 3, 18, 4, 12, 6,
72, 1
In order: 1, 2, 3, 4, 6, 8, 9,
12, 18, 24, 36, 72
Multiples
• A multiple of a number is the
product of that number and any
whole number
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
All you need to
do is skip count
by the number
to get its
multiples
You Try!!!
What are the multiples of 3?
3, 6, 9, 12, 15, 18, 21, 24
What are the multiples of 6?
6, 12, 18, 24, 30, 36, 42
What are the multiples of 9?
9, 18, 27, 36, 45, 54, 63
CHALLENGE: What are the multiples of
12?
12, 24, 36, 48, 60, 72, 84, 96
Prime Numbers
• Prime numbers are whole numbers with
exactly two factors- the number itself and 1
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 7 are:
7 and 1
You Try!!!
Is 12 a prime number? No, because its factors are 2,
6, 3, 4, 12, and 1
Is 11 a prime number? Yes, because its factors are
only 11 and 1
Is 23 a prime number? Yes, because its factors are
only 23 and 1
Is 14 a prime number? No, because its factors are 2,
7, 14, and 1
Composite
• Composite numbers are like opposites 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
You Try!!!
Is 18 a composite number?
Yes, because it has more
than two factors: 9, 2, 6, 3,
18, and 1
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
Is 3 a composite number?
No, because it has only two
factors: 3 and 1
Your turn- on your own!
Do all 3 and the stumper!
1)
Fill in the missing factors
of 48.
2)
What are the multiples of
8? (you can stop at 72)
8, 16, 24, 32, 40, 48, 56, 64
3)
Can you find all 8 prime numbers
smaller than 20?
2, 3, 5, 7, 11, 13, 17, 19
1, 2, 3,
_, 4, 6, _,
8, 12, 16,__,
16,24, 48
Stumper: If you have a whole number, and it is
greater than 2, and it is an even number, is it prime
or composite? Why?
It must be composite. If it is an even
number, then 2 must be a factor.