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No. You can start practising Prime factorisation straight away without an account. A free account keeps your results across sessions, so you can see your progress on this topic over time.

Factors, multiples and primes

Prime factorisation

50 self-marking GCSE and IGCSE practice questions on Prime factorisation, written specifically for AQA, Pearson, OCR, Pearson International GCSE Maths A (4MA1), Cambridge IGCSE Mathematics (0580), Cambridge IGCSE (9-1) Mathematics (0980) across Foundation and Higher and Core and Extended tier. Instant marking with full worked solutions on every question.

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Sample Prime factorisation questions

A few of the 50 questions, from easier to harder. Choose your exam board and tier to practise them, with every answer marked.

Question 12 marksGrade 3-4
Express 42 as the product of its prime factors.
Show the worked solution
Divide repeatedly by the smallest prime that divides exactly, until you reach 1:
42 ÷ 2 = 21
21 ÷ 3 = 7
7 ÷ 7 = 1 M1
42 = 2 × 3 × 7 A1
Question 22 marksGrade 4
Write down two prime numbers that have a sum of 32.
Show the worked solution
Testing pairs of primes: 3 + 29 = 32 ✓ (both prime). Another valid pair: 13 + 19 = 32 ✓. M1 A1

What are the common mistakes in Prime factorisation?

When a pupil makes one of these on Revision Workshop, the marking engine names the mistake and explains it, instead of just marking the answer wrong.

Lists every factor of a number instead of only its prime factors
Gave the count/list of ALL factors of 100 rather than expressing it as a product of PRIME factors only
Adds the powers of a common prime factor instead of multiplying when combining them
Added $2^{4}$ and $5^{2}$ instead of multiplying them - a prime factorisation is a PRODUCT, so the parts must be multiplied together
Misjudges whether a number is a perfect square based on the parity (odd/even) of an exponent

Quick answers about Prime factorisation

How many Prime factorisation practice questions are there?: There are 50 self-marking GCSE and IGCSE Maths questions on Prime factorisation, written for AQA, Pearson, OCR, Pearson International GCSE Maths A (4MA1), Cambridge IGCSE Mathematics (0580), Cambridge IGCSE (9-1) Mathematics (0980) across Foundation and Higher and Core and Extended tier. Each one is marked instantly and has a full worked solution.
Do I need an account to practise Prime factorisation?: No. You can start practising Prime factorisation straight away without an account. A free account keeps your results across sessions, so you can see your progress on this topic over time.