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Worksheets

Prime and Composite Numbers

Total questions: 50

Worksheet time: 46mins

Name
Class
Date
1.
Prime numbers have:
a)
Exactly 2 factors
b)
2 pairs of factors
c)
More than 2 factors
d)
1 factor
2.
Composite numbers:
a)
Are always bigger than prime numbers
b)
Have more than 2 factors
c)
Have 2 pairs of factors
d)
Don't have factors
3.

Which number is composite?

a)

11

b)

13

c)

21

d)

23

4.
Which number is NOT a factor of 10?
a)
1
b)
2
c)
3
d)
5
5.
Which is a prime number?
a)
15
b)
17
c)
21
d)
39
6.
Is 100 a prime or composite number?
a)
Prime
b)
Composite
7.
What are all prime numbers divisible by?
a)
1, 2, and itself
b)
1 and itself
c)
Every number from 1-10
d)
They aren't divisable at all
8.
Which of the following equations will NOT result in a multiple of 5?
a)
11 x 5 = _
b)
2 x 5 = _
c)
6 x 5 = _
d)
7 x 3 = _
9.
Which of the following numbers shows all of the factors of 12?
a)
1,2,3,4,6,12
b)
1,2,3,4,6,8,12
c)
1,2,4,6,12
d)
2,4,6,8,10,12
10.

What is a factor?

a)

"Factors" are the numbers you multiply to get another number. For instance, factors of 15 are 3 and 5, because 3×5 = 15, or 1 and 15, 1 x 15 = 15

b)

A factor is a number written in word form

c)

"Factors" tell you facts about all the numbers in the world

11.

Which statement is true?

a)

Some numbers have more than one factorization (more than one way of being factored). For instance, 12 can be factored as 1×12, 2×6, or 3×4.

b)

A number that can ONLY be factored by itself or 1 is a "composite" number

c)

Joey plays for Willunga Demons

d)

Izzy and Scarlet are not related

12.

What is the sum of all the prime numbers found in the picture?

(a)  

13.

What sum of all the composite numbers found in the picture?

(a)  

14.
What are factors?
a)
The top number in a fraction.
b)
The numbers multiplied together to make a product.
c)
The bottom number in a fraction.
d)
Angles smaller than 90 degrees.
15.
How is a prime number different from a composite number?
a)
Prime numbers are smaller than composite numbers.
b)
Composite numbers are larger than prime numbers.
c)
All odd numbers are prime numbers.
d)
Prime numbers have only 2 factors, and composite numbers have more than 2 factors.
16.
Are all even numbers composite numbers?
a)
Yes
b)
No
17.
Which one is a prime number?
a)
465
b)
822
c)
600
d)
743
18.
Which one is prime?
a)
100
b)
455
c)
71
d)
182
19.
Which number below is NOT prime?
a)
2
b)
11
c)
13
d)
18
20.
Which of the following is a factor of 54?
a)
4
b)
7
c)
5
d)
9
21.
Is 3 a factor of 12?
a)
yes
b)
no
22.
Is 33 a prime or composite number?
a)
Prime
b)
Composite
23.
Is 81 prime or composite?
a)
Prime
b)
Composite 
24.
What do we call the answer to a multiplication question?
a)
sum
b)
difference
c)
quotient
d)
product
25.
Which list has only prime numbers?
a)
2, 3, 4, 5
b)
1, 5, 7, 9
c)
2, 3, 5, 7
d)
2, 4, 6, 8
26.
Which list is only composite numbers?
a)
1, 3, 4
b)
2, 4, 6
c)
4, 6, 8
d)
5, 6, 8
27.

The only even prime number

a)

24

b)

2

c)

1

d)

4

28.

The sum of my ones digit and tens digit is 10. My ones digit is greater than my tens digit. I am a prime number less than 30. What number am I?

a)

31

b)

28

c)

19

d)

29

29.

Prime numbers between 10 and 20 are

a)

11,12,17,19

b)

11,13,15,17

c)

11,13,17,18

d)

11, 17,13,19

30.
Which is a NOT a factor of 9?
a)
0
b)
1
c)
3
d)
9
31.
Factors shared by two or more whole numbers are called
a)
prime numbers
b)
common factors
c)
fractions
d)
operations
32.
A factor is 
a)
a number that is multiplied by another number to find a product
b)
the product of a given number and any whole number.
33.
the only factors prime numbers have are:
a)
0 and 1
b)
0 and itself
c)
1 and itself
d)
1
34.
Four students each made a list of prime numbers.
Eric:   5, 7 17, 23
Maya:  3, 5, 13, 17
Bella:  2, 3, 17, 19
Joan:  7, 11, 13, 21
Who made an error and included a composite number?
a)
Eric
b)
Maya
c)
Bella
d)
Joan
35.
I am a prime number between 30 and 40.  Which number could I be?
a)
31
b)
33
c)
36
d)
39
36.

One is a prime number

a)

True

b)

False

37.

One is

a)

Prime

b)

Composite

c)

Neither

38.
Randy's house number is a composite number.  Which of the following could be Randy's house number?
a)
29
b)
39
c)
59
d)
79
39.
How many prime numbers are there between 1 and 100?
a)
100
b)
75
c)
50
d)
25
40.
Number 27 is both ...
a)
even and composite
b)
odd and composite
c)
even and prime
d)
odd and prime
41.
How many composite numbers are there from 1-100?
a)
80
b)
75
c)
74
d)
30
42.

Zero is

a)

Prime

b)

Composite

c)

Neither

43.

Composite numbers have to be a product of a multiplication of at least two prime numbers. They also can have more factors either composite or prime.

a)

True

b)

False

44.

Numbers bigger than 5 ending in 0,2,4,5,6,8 cannot be prime numbers.

a)

True

b)

False

45.

All even numbers bigger than 2 (>2) are composite numbers

a)

True

b)

False

46.

Zero is not a composite number, because I cannot get a product from any multiplication of two or more prime numbers that will give me zero.

a)

True

b)

False

47.

If I add the digits of a number and I can divide the result by three without a remainder, then the number is divisible (can be divided) by three.

One example could be 15:

1+5=6 6 divides by 3 with no remainder this means 15 divides by 3 3x5=15

Is this true for all number whose digits sum up to a number divisible by 3?

a)

Yes

b)

No

48.

If I add the digits of a number and I can divide the result by 9 without a remainder, then the number is divisible (can be divided) by 9. Example 18: 1+8=9 (9 divides by 9, so 18 divides by nine). Does this work for all numbers where digits sum up to 9?

a)

Yes

b)

No

49.

If a number divides by 2 and by 3 it divides by 6.

a)

True

b)

False

50.

If a number divides by 3 and 4 it divides by 7

a)

True

b)

False

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