Divisibility Rules
Prime/Composite
Factors
Multiples
Review
100
All Even Numbers
What are numbers divisible by 2?
100
3, 5, 7, 11, 13, 17, 19
What are all prime numbers under 20.
100
What are the factors of 20?
{1, 2, 4, 5, 10, 20}
100
What is a multiple? Give an example to support your definition.
The product of a number and any whole number. Multiples of 4 = 0, 4, 8, 12, 16, 20, 24...
100
5.2% is _________ _________ 5.2 (greater than, less than, equal to)
less than because 5.2% / 100 = .052
200
Whole numbers with a zero in the ones place.
What are numbers divisible by 10.
200
Give an example of a composite number. Why is it composite?
(Numbers will vary.) Because it has more than 2 factors.
200
List all the factors of 12.
{1, 2, 3, 4, 6, 12}
200
List the next 4 multiples of 4 {0, ____ , ____ , ____ , ____ ....}
4, 8, 12, 16
200
What is 2 x (3+5) - 6
10
300

I am the product of 4 and 7

28

300
Give an example of a prime number. Why is it prime?
(Numbers will vary.) Because it has exactly 2 factors.
300
What is the GCF of 30 and 72?
30{1, 2, 3, 5, 6, 10, 15, 30} 72{1, 2, 3, 4, 6, 8, 9, 12, 18 ,24 ,36 ,72} GCF = 6
300
List the next 4 multiples of 6 {0, ____ , ____ , ____ , ____ ....}
6, 12, 18, 24
300

Subtract 1 from a square number to make me a multiple of 7. 

36 - 1 = 35

400

I am the seventh square number.

49

400

What two numbers are neither prime nor composite.

0 and 1

400

List the first 5 triangular numbers.

1, 3, 6, 10, 15

400
What is the LCM of 4 and 6? excluding 0.
4 {4, 8, 12, ...} 6 {6, 12, ...} LCM = 12
400
Order the follwing from least to greatest: 9.09, 0.090, 9, 9.0090
0.090, 9, 9.0090, 9.09
500
A number that is divisible by 10 will "always", "sometimes" or "never" be divisble by 2 and 5. Why?
Always. Because a number that ends in a zero (divisible by 10) also works with the 2 (even) and 5 (ends in 0 or 5) rules.
500
Is 51 prime or composite? Why?
Composite, because it has more than 2 factors. 1 x 51 = 51 and 3 x 17 = 51
500
What is a factor? Give an example to support your definition.
Factors are the numbers multiplied to get a product. {1, 2, 4} are factors of 4; because 1x4=4 and 2x2=4
500
What number is a multiple of all numnbers?
ZERO
500
How do you write seven squared?
7 to the second power
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