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 ...

When whole numbers are multiplied together, the answer is a multiple of each of these numbers. For example, 6 x 2=12 so 12 is a multiple of both 6 and 2. Numbers that divide exactly into another ...

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 ...