 # Is it Prime?

In this worksheet, students state whether or not a number is prime. Key stage:  KS 2

Curriculum topic:   Number: Multiplication and Division

Curriculum subtopic:   Know Prime Numbers

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### QUESTION 1 of 10

A number such as 6 has 4 factors, shown on the legs of this factor spider. The number 12 has 6 factors, shown on the legs of this factor spider. Some factor spiders, such as the number 7, only have TWO legs.

These are the PRIME NUMBER factor spiders. Prime numbers are very special.

They have only two factors, 1 and the number itself.

Is the following number a prime number?

4

Yes

No

Is the following number a prime number?

6

Yes

No

Is the following number a prime number?

12

Yes

No

Is the following number a prime number?

7

Yes

No

Is the following number a prime number?

3

Yes

No

Is the following number a prime number?

9

Yes

No

Is the following number a prime number?

2

Yes

No

Is the following number a prime number?

10

Yes

No

Is the following number a prime number?

11

Yes

No

Is the following number a prime number?

1

Yes

No

• Question 1

Is the following number a prime number?

4

No
EDDIE SAYS
4 has three factors, 1, 2 and 4, so it's a square number.
• Question 2

Is the following number a prime number?

6

No
EDDIE SAYS
6 has four factors: 1, 2, 3, 6
• Question 3

Is the following number a prime number?

12

No
EDDIE SAYS
12 has six factors: 1, 2, 3, 4, 6, 12
• Question 4

Is the following number a prime number?

7

Yes
EDDIE SAYS
Prime 7: 1, 7
• Question 5

Is the following number a prime number?

3

Yes
EDDIE SAYS
Prime 3: 1, 3
• Question 6

Is the following number a prime number?

9

No
EDDIE SAYS
9 has three factors, 1, 3, and 9, so it's a square number.
• Question 7

Is the following number a prime number?

2

Yes
EDDIE SAYS
2 is the only even prime number
• Question 8

Is the following number a prime number?

10

No
EDDIE SAYS
10 has four factors: 1, 2, 5, 10
• Question 9

Is the following number a prime number?

11

Yes
EDDIE SAYS
Prime 11: 1, 11
• Question 10

Is the following number a prime number?

1

No
EDDIE SAYS
1 is a square number and only has one factor. A prime number must have exactly two factors.
---- OR ----

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