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This video shows how to find the Highest Common Factor and Lowest Common Multiple. It takes time to show you what they are and why they are used. HCF: Highest common factor. LCM: Lowest common multiple

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This video helps you understand what a prime number is and, by association, what a composite number is. It takes a look at why numbers are prime and how to find them using simple rules. There are examples of prime numbers.

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This video looks at how to do prime decomposition which means splitting a number into the product of its primes. There is also a discussion relating to expanded notation and index form

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This video looks at what Square numbers are and how to find the square roots of numbers.
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These are the videos which are available in each chapter. You will notice that some are free and some are for subscribers only. Making and hosting these videos costs a little bit of money. To help pay for the hosting fees I have no choice but to hide some of the videos and make them for subscribers only.