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

Checking understanding of prime numbers

Maths

This unit on factors, multiples, squares and cubes helps pupils build on their understanding that any positive integer can be expressed as a product of its factors. This skill is used in the next unit to explore multiplying and dividing with decimals.

In this unit, pupils learnt how to identify common factors and common multiples. in this unit, pupils build on this understanding to find the LCM and HCF

Properties of number: factors, multiples, squares and cubes

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

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

Which of the following is not a prime number?

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

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

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

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

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

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

The {{ }} of two factors gives a multiple.

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

Which factor is missing from the Venn diagram?

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

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

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

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

This lesson will soon be taken down.

Checking understanding of prime numbers

Lesson outcome