To get the best deal on Tutoring, call 1-855-666-7440 (Toll Free)

Prime and Composite Numbers Worksheet - Page 3

Prime and Composite Numbers Worksheet
  • Page 3
 21.  
_____ is the only even and the smallest prime number.
a.
1
b.
3
c.
2


Solution:

2 is the only even and the smallest prime number.


Correct answer : (4)
 22.  
Every _________ number can be written as the product of prime numbers.
a.
Whole
b.
Prime
c.
Composite
d.
None of the above


Solution:

Every composite number can be written as the product of prime numbers.


Correct answer : (3)
 23.  
Since 1 has only _____ factor(s), it is neither prime nor composite.
a.
4
b.
2
c.
1


Solution:

Since 1 has only 1 factor, it is neither prime nor composite.


Correct answer : (4)
 24.  
The greatest prime number less than 100 is ____.
a.
99
b.
91
c.
97
d.
95


Solution:

The greatest prime number less than 100 is 97.


Correct answer : (3)
 25.  
Every ________ number greater than 2 is either prime or composite.
a.
Real
b.
Complex
c.
Whole
d.
Natural


Solution:

Every whole number greater than 2 is either prime or composite.


Correct answer : (3)
 26.  
Which of the following is not a prime number?
a.
2
b.
17
c.
11
d.
12


Solution:

A prime number has exactly two factors, 1 and itself.

Factors of 11: 1 and 11
Factors of 19: 1 and 19
Factors of 17: 1 and 17
Factors of 12: 1, 2, 3, 4, 6, 12

The number 12 has more than 2 factors.

So, the number 12 is not a prime number.


Correct answer : (4)
 27.  
Which of the following is not a composite number?
a.
12
b.
17
c.
22
d.
26


Solution:

A composite number has more than two factors.

Factors of 26: 1, 2, 13 and 26
Factors of 22: 1, 2, 11 and 22
Factors of 17: 1 and 17
Factors of 12: 1, 2, 3, 4, 6, 12

The number 17 has exactly 2 factors, 1 and 17.

So, the number 17 is not a composite number.


Correct answer : (2)
 28.  
Which of the following arrays shows a prime number?


a.
Figure 3
b.
Figure 1
c.
Figure 4
d.
Figure 2


Solution:

A prime number is represented using exactly one rectangular array.

In the given figure, Figure 3 shows exactly one rectangular array.

So, the array represented in Figure 3 shows a prime number.


Correct answer : (1)

*AP and SAT are registered trademarks of the College Board.