Prime & Composite
Is 9 a prime or composite number? Why? If composite, list the factors.
Composite. 9 has more than 2 factors. The factors of 9 are 1x9 and 3x3.
Which is NOT a factor of 20?
a. 20
b. 6
c. 4
d. 10
b. 6 is not a factor of 20.
The number pattern below follows a skip counting rule.
10, 22, 34, 46, 58 ......
Which pattern below follows the same rule?
a. 5, 10, 15, 20
b. 2, 10, 8, 16, 14, 28
c. 4, 16, 28, 40, 52
d. 7, 14, 21, 28, 35
c. 4, 16, 28, 40, 52
The rule is "Add 12"
9x8
72
How many possible arrays can you make for 20? Draw them
6 possible arrays.
1x20, 20x1, 2x10, 10x2, 4x5, 5x4
Is 1 prime or composite? Why? If composite, list the factors.
1 is neither prime or composite.
Which number is a factor of 40, but not a multiple of 2? Explain your answer.
a. 2
b. 10
c. 5
d. 18
c. 5 is a factor of 40 but not a multiple 2.
The following numbers follow a pattern of multiply by 2, add 6.
2, 10, 26, 58
What is the next number in the pattern?
58 x 2 =116 + 6 = 122
7x6
42
Each pack of cookies contains 7 pieces. Veronica has all unopened packs of cookies. If she counted all the cookies, is it possible for her to have exactly 43 pieces? Show or explain why or why not.
No it is not possible because 43 is not a multiple of 7.
Is 2 prime or composite? Why? If composite, list the factors.
The number 2 is prime because it only has 2 factors, 1 and itself.
Select all the factors of 36:
a. 1
b. 2
c. 3
d. 4
e. 5
f. 6
g. 8
h. 10
a, b, c, d, f
Look at the pattern below. What is the rule of the pattern?
11, 15, 14, 18, 17
The rule is "Add 4, Subtract 1"
8x12
96
24 is a multiple of:
a) 1, 2, 12, 24
b) 1, 2, 4, 6, 8, 12, 24
c) 1, 2, 4, 6, 12, 24
d) 1, 2, 4, 8, 16, 24
Is 67 prime or composite? Why? If Composite list the factors.
67 is prime because it only has 2 factors. 1 and itself.
Write all the factor pairs for 48. Is 48 a prime or composite? Explain.
1x48, 2x24, 3x16, 4x12, 6x8
48 is composite because it has more than 2 factors.
The rule is “subtract 6”. What are the next three numbers in the pattern? Describe two features of the pattern.
48, 42, 36, 30, 24......
18, 12, 6
Numbers are all even
The one's column goes in the order 8, 2, 6, 0, 4
They are all composite numbers
7x9
63
Which number is a factor of 18, but not a multiple of 3?
A. 2
B. 6
C. 9
D. 8
D. 8
Is 93 prime or composite? Why? If composite, list the factors.
93 is composite. The factors of 93 are: 1x93, 3x31
Determine whether these numbers are factors or multiples of 14:
14
28
42
56
70
They are multiples
The following numbers follow a pattern of multiply by 3, add 2.
2, 8, 26, 80
What is the next number in the pattern?
242
12 x 6
72
Which number is a factor of 16, but not a multiple of 4?
A. 6
B. 10
C. 2
D. 8
C. 2