Checking understanding of prime numbers | Maths | Quizalize & Oak National Academy

Starter quiz

The ______ of two factors gives a multiple.

'product' ✓
Which of the following is not a factor pair of 72?

9 × 8

12 × 6

3 × 24

2 × 37 ✓
Which factor is missing from the Venn diagram?

'7' ✓
Which of the following is not a common factor of 24 and 32?

4

8

12 ✓

16 ✓
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

9 is a common factor of 18 and 30 ✓
How many factors does 13 have?

'2' ✓

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

'2' ✓
Which of the following arrays shows that 9 is not a prime number?
Which of the following is not a prime number?

3

17

21 ✓

37
True or false? 51 is 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 or false? All numbers ending in 3 are prime numbers.

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

False, 33 ends in a 3, but it has 2 factor pairs. ✓
Which number is the odd one out in this list? 43, 53, 63, 73

43

53

63 ✓

73

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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.