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Checking understanding of prime numbers

I can state the properties of a prime number and can identify prime numbers.

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Lesson 13 of 19

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Year 7

Checking understanding of prime numbers

I can state the properties of a prime number and can identify prime numbers.

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Lesson details

Key learning points

Prime numbers all share the same properties.
Prime numbers can be identified using factors.
Prime numbers can be identified using multiples.
The Sieve of Eratosthenes is an efficient method for finding primes.

Keywords

Prime - A prime number is an integer greater than one with exactly two factors.

Common misconception

1 is a prime number

1 is not a prime number as it only has one factor and a prime number has exactly two factors.

To bring prime numbers to life you could look at Eratosthenes in more detail. When you have been through the sieve of Eratosthenes challenge students to memorise them and then go around the class and recite them in order.

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This content is © Oak National Academy Limited (2025), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

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Prior knowledge starter quiz

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6 Questions

Q1.
The of two factors gives a multiple.

Correct Answer: product

Q2.
Which of the following is not a factor pair of 72?

9 × 8

12 × 6

3 × 24

Correct answer: 2 × 37

Q3.
Which factor is missing from the Venn diagram?

Correct Answer: 7, seven

Q4.
Which of the following is not a common factor of 24 and 32?

Correct answer: 12

Correct answer: 16

Q5.
Which of the following is not true of the Venn diagram?

5, 10, 15 and 30 are factors of 30 but not 18

The common factors of 18 and 30 are all factors of 6

30 has more factors than 18

Correct answer: 9 is a common factor of 18 and 30

Q6.
How many factors does 13 have?

Correct Answer: 2, two

Assessment exit quiz

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6 Questions

Q1.
Fill in the missing word from this sentence: A prime number has exactly factors.

Correct Answer: 2, two

Q2.
Which of the following arrays shows that 9 is not a prime number?

Correct Answer: An image in a quiz

Q3.
Which of the following is not a prime number?

Correct answer: 21

Q4.
True or false? 51 is a prime number.

True, you can't divide it by 2, 5, 7 or 10.

Correct answer: False, it has more than 2 factors: $$1 \times 51$$ and $$3 \times 17$$

Q5.
True or false? All numbers ending in 3 are prime numbers.

True, because 3, 13 and 23 are prime numbers.

Correct answer: False, 33 ends in a 3, but it has 2 factor pairs.

Q6.
Which number is the odd one out in this list? 43, 53, 63, 73

Correct answer: 63

Lesson appears in

UnitMaths / Properties of number: factors, multiples, squares and cubes

Maths

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Checking understanding of prime numbers

Checking understanding of prime numbers

Lesson slides

Lesson details

Key learning points

Keywords

Common misconception

Licence

Lesson video

Worksheet

Prior knowledge starter quiz

6 Questions

Q1.The of two factors gives a multiple.

Q2.Which of the following is not a factor pair of 72?

Q3.Which factor is missing from the Venn diagram?

Q4.Which of the following is not a common factor of 24 and 32?

Q5.Which of the following is not true of the Venn diagram?

Q6.How many factors does 13 have?

Assessment exit quiz

6 Questions

Q1.Fill in the missing word from this sentence: A prime number has exactly factors.

Q2.Which of the following arrays shows that 9 is not a prime number?

Q3.Which of the following is not a prime number?

Q4.True or false? 51 is a prime number.

Q5.True or false? All numbers ending in 3 are prime numbers.

Q6.Which number is the odd one out in this list? 43, 53, 63, 73

Lesson appears in

UnitMaths / Properties of number: factors, multiples, squares and cubes

Maths

Q1.
The of two factors gives a multiple.

Q2.
Which of the following is not a factor pair of 72?

Q3.
Which factor is missing from the Venn diagram?

Q4.
Which of the following is not a common factor of 24 and 32?

Q5.
Which of the following is not true of the Venn diagram?

Q6.
How many factors does 13 have?

Q1.
Fill in the missing word from this sentence: A prime number has exactly factors.

Q2.
Which of the following arrays shows that 9 is not a prime number?

Q3.
Which of the following is not a prime number?

Q4.
True or false? 51 is a prime number.

Q5.
True or false? All numbers ending in 3 are prime numbers.

Q6.
Which number is the odd one out in this list? 43, 53, 63, 73