 # Factors and Prime Factors (2)

In this worksheet, students identify factors and prime factors of the given numbers. Key stage:  KS 2

Curriculum topic:   Maths and Numerical Reasoning

Curriculum subtopic:   Special Numbers

Difficulty level:   ### QUESTION 1 of 10

A FACTOR is a number that divides exactly into another number.

A PRIME number is one that only has two factors, itself and 1.

A PRIME FACTOR is a factor that also happens to be a prime number.

Example

The number 42 has factors 42, 21, 14, 7, 6, 3, 2 and 1.

Which of these are PRIME FACTORS?

The only prime numbers in this list are 2, 3 and 7.

Remember that 1 is not a prime number.

So the PRIME FACTORS of 42 are 2, 3 and 7.

The number 14 has factors 14, 7, 2 and 1.

Which of these are PRIME FACTORS?

14

7

2

1

The number 15 has factors 15, 5, 3, and 1.

Which of these are PRIME FACTORS?

15

5

3

1

The number 12 has factors 12, 6, 4, 3, 2 and 1.

Which of these are PRIME FACTORS?

12

6

4

3

2

1

The number 16 has factors 16, 8, 4, 2 and 1.

Which of these are PRIME FACTORS?

16

8

4

2

1

The number 18 has factors 18, 9, 6, 3, 2 and 1.

Which of these are PRIME FACTORS?

18

9

6

3

2

1

The number 20 has factors 20, 10, 5, 4, 2 and 1.

Which of these are PRIME FACTORS?

20

10

5

4

2

1

The number 21 has factors 21, 7, 3 and 1.

Which of these are PRIME FACTORS?

21

7

3

1

The number 22 has factors 22, 11, 2 and 1.

Which of these are PRIME FACTORS?

22

11

2

1

The number 23 has factors 23 and 1.

Which of these are PRIME FACTORS?

23

1

The number 24 has factors 24, 12, 8, 6, 4, 3, 2 and 1.

Which of these are PRIME FACTORS?

24

12

8

6

4

3

2

1

• Question 1

The number 14 has factors 14, 7, 2 and 1.

Which of these are PRIME FACTORS?

7
2
EDDIE SAYS
2 and 7 are the only prime numbers in the list.
• Question 2

The number 15 has factors 15, 5, 3, and 1.

Which of these are PRIME FACTORS?

5
3
EDDIE SAYS
3 and 5 are the only prime numbers in the list.
• Question 3

The number 12 has factors 12, 6, 4, 3, 2 and 1.

Which of these are PRIME FACTORS?

3
2
EDDIE SAYS
2 and 3 are the only prime numbers in the list.
• Question 4

The number 16 has factors 16, 8, 4, 2 and 1.

Which of these are PRIME FACTORS?

2
EDDIE SAYS
2 is the only prime number in the list.
• Question 5

The number 18 has factors 18, 9, 6, 3, 2 and 1.

Which of these are PRIME FACTORS?

3
2
EDDIE SAYS
2 and 3 are the only prime numbers in the list.
• Question 6

The number 20 has factors 20, 10, 5, 4, 2 and 1.

Which of these are PRIME FACTORS?

5
2
EDDIE SAYS
2 and 5 are the only prime numbers in the list.
• Question 7

The number 21 has factors 21, 7, 3 and 1.

Which of these are PRIME FACTORS?

7
3
EDDIE SAYS
3 and 7 are the only prime numbers in the list.
• Question 8

The number 22 has factors 22, 11, 2 and 1.

Which of these are PRIME FACTORS?

11
2
EDDIE SAYS
2 and 11 are the only prime numbers in the list.
• Question 9

The number 23 has factors 23 and 1.

Which of these are PRIME FACTORS?

23
EDDIE SAYS
23 is the only prime number in the list.
1 is not a prime number.
• Question 10

The number 24 has factors 24, 12, 8, 6, 4, 3, 2 and 1.

Which of these are PRIME FACTORS?

3
2
EDDIE SAYS
2 and 3 are the only prime numbers in the list.
---- OR ----

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