Factors
List all the factor pairs of 32
1, 32
2, 16
4, 8
List the first five multiples of 4
4, 8, 12, 16, 20
What is a prime number?
A number that has only one factor pair.
True or False
35 is a factor of 5
False
35 is a MULTIPLE of 5
5 is a factor of 35
Lin has wants to get stickers for his friends. The store has packs of 6 stickers each. How many packs does he need to buy for his 24 friends?
4 packs of stickers because 6 and 6 are factors of 24.
(24 is a multiple of 4 and 6)
4 x 6 = 24
What does factor pair mean?
Two numbers multiplied together to get a specific product.
What is a multiple?
To find multiples you can skip count.
A multiple is the product of multiplying two whole numbers.
Is 17 prime or composite? How do you know?
Prime because
1 x 17
True or False
5 is a multiple of 50
False
5 is a FACTOR of 50
50 is a multiple of 5
Mia needs 60 hot dogs for a BBQ. Hot dogs come in packages of 10. How many packages doe she need for the BBQ? Share your thinking.
She needs 6 packages because 60 is a multiple of 10 and 6.
6 x 10 = 60
1, 2, 3, 4, 6, 12
21 is a multiple of _____.
3 and 7
Is 10 prime or composite? How do you know?
Composite because:
1 x 10, 2 x 5
True or False
12 is a factor of 36.
True
12 x 3 = 36
Jada is making cookie for a school bake sale. She can package them up in bags of 3 cookies or bags of 4 cookies.
She needs to make 36. How should she bag up the cookies and how many bags will she need?
Either:
Bags of 3 cookies, she will need 12 bags
3 x 12 = 36
OR
Bags of 4, she will need 9 bags
4 x 9 = 36
List the factor pairs for 50.
1 x 50, 2 x 25, 5 x 10
54 is a multiple of _____.
6 and 9
Is 49 prime or composite? How do you know?
Composite
1 x 49
7 x 7
True or False
27 is prime.
False
1 x 27, 3 x 27
Han is having his 2 friends over after school. His mom is making them an after school snack. Han wants the snack to be divided up equally between the 3 of them. If mom makes 20 cookies, will there be enough for them all to have an equal amount with none left over? Share your thinking.
No, 20 is NOT a multiple of 3.
What are the factors of 48?
1, 2, 3, 4, 6, 8, 12, 16, 24, 48
What multiple do 2, 4, 5 and 10 share?
20
Is 27 prime or composite? How do you know?
Composite:
1 x 27, 3 x 9
True or False
63 is prime.
False
1 x 63, 3 x 21, 7 x 9
Han is having his 2 friends over after school. His mom is making them an after school snack. Han wants the snack to be divided up equally between the 3 of them. If mom makes 36 cookies, will there be enough for them all to have an equal amount with none left over? Share your thinking.
Yes, each person would get 12 cookies (yum!)
36 is a multiple of 3
12 x 3 = 36