Some free math worksheet sites allow you to choose criteria, click a button, and generate a web page of problems. These types of web sites allow for worksheets that produce random digits in numbers. You should find more robust problems sets on web_generated math worksheets. How can web sites give away math worksheets? Do free math worksheet web sites make money? Yes and no. Let's just say it is very important that you visit and support your favorite free math worksheets web site!
Who's Fault? Is it his fault that he lacks confidence with word problems? Not entirely. Our actions, as educators, seem to imply a belief that solving word problems should come more naturally than simpler operations like arithmetic and algebra. Many parents and teachers feel justified in encouraging (i.e. forcing) a child to work hundreds or thousands of math worksheets, drill multiplication tables, long division... but few encourage solving hundreds of story problems. One suspects that the relative ease of creating and checking ordinary math worksheets keeps the focus of math education on simple, atomic operations at the expense of more holistic story problems.