This spreadsheet creates an A4 worksheet to print out with about 100 questions, and a second page with the answers. It can be used to create class or homework exercises for practice, or a test. The table to be practiced is selected by entering a number in the top line, and then choose random questions up to 10 or up to 12. Each worksheet is unique, it generates a different random set of questions whenever ENTER or F9 is pressed. The worksheet and answer-sheet are linked by a reference number. Great for lots of practice.