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Prime and composite numbers · question bank

Prime and composite numbers: question bank

Practise every part of the topic, from finding factors to olympiad-style puzzles. Questions are grouped by skill and graded foundation, core, stretch and challenge. Every question has a worked solution: read it even when you get the answer right, because it often shows a faster method.

Foundation 20Core 28Stretch 22Challenge 9

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All 79 questions

Showing 15 of 79 matching questions.

Q1

FoundationFactors and multiples

How many factors does 24 have?

Q2

FoundationFactors and multiples

Which of these is a multiple of 9?

Q3

FoundationFactors and multiples

What is the 7th multiple of 8?

Q4

FoundationFactors and multiples

Ravi writes: "The factors of 16 are 1, 2, 4, 6, 8, 16." Which number in his list is wrong?

Q5

CoreFactors and multiples

A sweet shop in Madurai packs 36 laddoos into boxes with the same number in each box and none left over. Each box must hold more than 1 laddoo and fewer than 36. How many different box sizes are possible?

Q6

CoreFactors and multiples

Select all the factors of 45.

Choose all that apply.

Q7

CoreFactors and multiples

Which statement is true?

Q8

CoreFactors and multiples

What is the sum of all the factors of 28?

Q9

StretchFactors and multiples

How many multiples of 7 lie between 100 and 200?

Q10

StretchFactors and multiples

What is the smallest number that has exactly 6 factors?

Q11

FoundationPrime or composite?

Which of these numbers is prime?

Q12

FoundationPrime or composite?

Which of these numbers is composite?

Q13

FoundationPrime or composite?

True or false: every composite number has at least three factors.

Q14

FoundationPrime or composite?

A teacher has 47 students. Can she arrange them in equal rows with more than one row and more than one student in each row?

Q15

CorePrime or composite?

How many prime numbers are there between 30 and 50?

Stuck? The lessons explain every idea these questions use.