Teachers, who are adept in the subject, rack their brains and generate new worksheets with a support answer key to guide the instructor. There is no limit to the number of worksheets you generate for the class or tutorials and they can be used for distribution purposes.
Developers of free math worksheets primarily use either of two methods for displaying and printing worksheets on the Internet. PDF pages require an additional piece of software, Adobe Acrobat, which should automatically open worksheets in your browser. PDF worksheets theoretically cannot be manipulated and display/print precisely as the developer designed. The second mode of delivery, HTML code, displays worksheets directly in your browser window. The downside of using HTML based worksheets is they are prone to printing problems. A worksheet meant for one page can easily bleed over to a second sheet.