Prime/Composite
Is 28 a prime or composite number?
What are all the factor pairs of 29.
(1,29)
Multiple answers.
18 is a factor of 9
False
Is 39 a prime or composite number?
What are all the factor pairs of 100.
(1,100) (2,50) (4,25) (5,20) (10,10)
If Sam has 60 playing cards, can he share equally with 7 people?
No because 7 is not a factor of 60.
5 is a multiple of 10
False
How do you know that a number is prime?
All prime numbers only have one factor pair. One and itself.
Could be
(1,28) (2,14) (4,7)
If there are 25 students in a class, could the teacher buy a pack of pencils with no leftovers if packs are sold 10 or 12?
NO
10 is a multiple of 2
How do you know a number is composite?
All composite numbers have more than one factor pair.
What factor are all the possible sides of a rectangle that has a square unit of 42.
(1,42) (2,21) (3,14) (6,7)
We are planning a party for 98 students. If we have tables and chairs that sit 6 and 10 can we sit students without extra seats?
No
The factor pairs of 24 are (1,24) (6,4) (2,12)
False (3,8)
What is the number 1 considered? Prime or composite or neither?
Neither? Prime and composite numbers are greater than one
What are all the possible lengths and width of a rectangle with a area of 51.
(1,51)
We want to plan a party for all of fourth grade. We need 100 ice cream bars. What would be the best box to buy? Boxes of 25 or boxes of 10 and why?
25
125 is a multiple of 5
True