How to use the page up and page down function on a Mac

Not all keyboards are made the same. There are full keyboards, ergonomic keyboards, keyboards different layouts and more. For people who read a lot on the web or need to scan pages quickly, the page up and page down keys are vital keys to productivity. With most Mac laptop and computers the Page Up and Page Down keys are not present on the standard Apple keyboards. But you can still use the function. 
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