# Prime and Composite Numbers Practice (Grade 4)

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## Prime and Composite Numbers Practice

**Instructions:**
A prime number is any whole number greater than 1 that has only 1 and itself for factors. The number 5 is prime. 5 only has the numbers 1 and 5 for factors.

A composite number is any whole number that has factors other than just 1 and itself. The number 10 is composite. It has the numbers 1, 2, 5, and 10 for factors.

Use your knowledge of prime and composite numbers to answer the following questions.

1.

A prime number has how many factors?

- 0
- 1
- 2
- 3

2.

A composite number has how many factors?

- 0
- 1
- 2
- more than 2

3.

Is the number 24 a prime or composite number?

- Prime
- Composite

4.

Is the number 60 prime or composite?

- prime
- composite

5.

53 is a number.

- Prime
- Composite

6.

21 is a number.

- Prime
- Composite

7.

47 is a prime number.

- True
- False

8.

79 is a prime number.

- True
- False

9.

The numbers 2, 3, 5, 7, and 11 are all composite numbers.

- True
- False

10.

Which number is composite?

- 3
- 5
- 7
- 9

11.

Which number is prime?

- 1
- 2
- 4
- 6

12.

Which number below is a prime number?

- 6
- 11
- 15
- 25

13.

Which of the following numbers is a not a prime number?

- 3
- 7
- 17
- 25

14.

Which of the following numbers is prime?

- 17
- 18
- 56
- 81

15.

Which number is composite?

- 13
- 29
- 47
- 14

16.

Which number below is a composite number?

- 1
- 3
- 23
- 37
- 45

17.

Which set of numbers are ALL prime?

- 4, 6, 7
- 8, 10, 12
- 3, 5, 7
- 9, 11, 15

18.

Which group contains only prime numbers?

- 11, 17, 37, 39
- 7, 19, 33, 41
- 7, 11, 27, 43
- 5, 13, 29, 47

19.

Find two prime numbers between 30 and 45.

20.

The number 13 is prime. When the digits are reversed we get 31 and 31 is also prime. Find another number pair with this property.

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