### Prime and composite numbers

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Prime and Composite numbers Prime numbers are numbers that have exactly two factors: one and the number itself. Composite numbers are numbers that have more than two factors. Finding prime numbers Over 2000 years ago, a Greek mathematician called “Eratosthenes” made a simple tool for sorting out prime numbers. This tool is called the “Sieve of Eratosthenes” […]

### Multiples and Factors

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Multiples and Factors Multiples You can think multiples of a number as the” times table” for that number. For example: the multiplies of 3 are:3 × 1 = 3,  3 × 2 = 6,  3 × 3 = 9 and so on. A multiple of a number is found when you multiply that number by a positive integer. The […]