Prime Numbers
Maths: Edexcel IGCSE Higher, topic 1.1.9
Prime Numbers
A prime number is a number whose only factors are itself and 1. Remember 1 is not a prime number.
Examples of prime numbers
Find the prime numbers we can multiply together to make 50
- This is called "prime factor decomposition'.
2 is prime, 25 isn't so can be broken down again
2, 5 and 5 are all prime numbers
Prime factor decomposition of 50
Test yourself on Prime Numbers
Which of these are prime numbers?
In the prime number decomposition of 420, what should replace 'A'?
In the prime number decomposition of 420, what should replace 'B'?
In the prime number decomposition of 420, what should replace 'C'?