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!
8
What are the factors of 17?
1 x 17
Sarah buys a video game for 40 dollars. She buys a toy for 10 dollars. How many more times than the toy did the video game cost?
4 times more!
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? 8 x ______ = 32
4
What are the factors of 18?
1 x 18, 2 x 9, 3 x 6
Michelle saw 3 columns of markers in a box of 15 markers. How many markers were in each column?
5 markers
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
What goes in the blank 25 x ______ = 100
4
What are the factors of 32?
1 x 32, 2 x 16, 4 x 8
At the blue table there was 4 kids each with three pencils. At the red table, there was 5 kids each with 4 pencils. How many pencils were there all together?
32 pencils