In Room 20 we have been learning about prime numbers. A prime number is a number that only has two factors. It can only be times by itself and one. Here is a list of some of the prime numbers 2,3,5,7,11,13,17,19,23,29,31,33...
We also found out that 2 is the only even prime number, that 1 is not a prime number because it only has one factor - 1, that all prime numbers except for 2 are odd but not all odd numbers are primes.
You helps to be good at your times tables to work out if a number is a prime number.
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