The first factor pair is always 1 and the number itself. Consider whether the number is divisible, in turn, by 2, 3, 4, etc. Divide to find the other factor of the pair. All the factors are found when ...

mathematics number theory prime numbers twin primes conjecture All topics More than 2,000 years ago, the Greek mathematician Eratosthenes came up with a method for finding prime numbers that continues ...

How to work out which numbers are multiples of three. A class is asked to find a number from a range between 750 and 800 which is a multiple of three. There is also a demonstration of how to find even ...