Basic Facts Worksheet Factory can generate worksheets that will provide students with the practice they need to become proficient in the basic math operations. You can create unlimited customized worksheets for the practice of arithmetic facts in addition, subtraction, multiplication, and division. It lets you see exactly what your worksheet will look like as you design it. You can create worksheets with as many questions as you wish from 1 to 100 and lay them out in either a horizontal or a vertical format. Then customize the worksheet by changing the picture, header, font, and riddle or quotation.