Prime/Composite
Is the number 7 prime or composite?
Prime!
21 dollars
4 x 7 =
28
What are the factors of 3?
1 and 3
Jack bought a toy for 12 dollars. He paid twice as much for his shirt. How much does his shirt cost?
24 dollars
Is the number 12 prime or composite?
Composite
Steve is 11 years old. His father is 4 times older than him. How old is his father?
44 years old
5 x 9 =
45
What are the factors of 9
1 x 9, 3 x 3
The girls buy cupcakes for 5 dollars. Mom buys a cake that is 4 times more than the cupcakes. How much does the cake cost?
20 dollars!
Is the number 18 prime or composite?
Composite
The equation 5 x 8 = 40 can mean:
1. 8 folders minus 5 folders equals 40 folders.
2. 5 folders split into 8 groups equals 40 folders.
3. 5 folders and 8 folders put together is 40 folders.
4. 5 kids times 8 folders each equals 40 total folders.
4! 5 kids times 8 folders each equals 40 folders!
What goes in the blank: 3 x _____ = 24
8
What are the factors of 32?
1 x 32, 2 x 16, 8x 4
Jack has $10. Jill has 15 times as much money as Jack. How much money does Jill have?
$150
What makes a number prime?
When the only factors of a number is the same number and 1. Example: 11 is prime because the only factors for 11 is 11 x 1
Jack had 25 dogs. That is 5 times as many dogs as his sister Sam had. How many dogs does Sam have?
5!
What goes in the blank? 9 x ______ = 54
What are the factors of 18?
1 x 18, 2 x 9, 3 x 6
Hope has 16 kittens. Hope has four times as many kittens as Joseph. How many kittens does Joseph have?
4 kittens
What makes a number composite?
When a number has more than two factors!
Example: 14 is composite because it has the factors 1 x 14, 2 x 7
There are 3 kids at a table. Each kid has 5 folders. The whole class needs 5 times the amount of folders that the table has. How many folders do we need in all?
75 folders
12 x 7 =
84
What are the factors of 24?
1 x 24, 2 x 12, 3 x 8, 6 x 4
Tim saved $90. His little brother saved 6 times that. How much money do they have altogether?
$630