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
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.
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
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.