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Prime numbers

Year 5 maths · Number · 7 skills with hints, step-by-step help from Mago, video lessons and printable practice.

Example questions

  1. Is 18 a prime number?
  2. What is the largest prime factor of 105?
  3. I am a prime number between 70 and 80. My digits add up to 8. What number am I?
Not sure where to start? Take the free Start Check: about 12 questions, about 10 minutes, no account needed.