# Checking understanding of prime numbers

## Quiz by Oak National Academy: KS3 Maths (2)

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6 questions

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- Q1Fill in the missing word from this sentence: A prime number has exactly ______ factors.Users enter free textType an Answer30s
- Q2Which of the following arrays shows that 9 is not a prime number?30s
- Q3Which of the following is not a prime number?211737330s
- Q4True 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: $1\; \backslash times\; 51$ and $3\; \backslash times\; 17$30s
- Q5True or false? All numbers ending in 3 are prime numbers.False, 33 ends in a 3, but it has 2 factor pairs.True, because 3, 13 and 23 are prime numbers.30s
- Q6Which number is the odd one out in this list? 43, 53, 63, 736373435330s