Mathematics 0580 · Number
Factors, multiples and primes
Original revision summary · Syllabus edition awaiting review · Cambridge alignment awaiting review
Key idea 1
A prime number has exactly two factors: 1 and itself. 1 is not prime.
60
230
215
35
60 = 2 × 2 × 3 × 5 = 2² × 3 × 5
Split composite numbers until every branch ends in a prime.
Knowledge check · unscored
Which of these is a prime number?
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