I will admit that there is one type of worksheet that I used in the past and found relatively beneficial, although it had a different kind of flaw. For my Basic Math, Pre_Algebra, and Algebra classes, I had several books of "self_checking" worksheets. These worksheets had puns or puzzle questions at the top, and as the students worked the problems they were given some kind of code for choosing a letter to match that answer. If they worked the problems correctly, the letters eventually answered the pun or riddle. Students enjoyed these worksheets, but there are a couple problem areas even with these worksheets. Some students would get the answer to the riddle early and then work backward from letter to problem answer, so they weren't learning or practicing anything.
Books _ Among the dozen or so math word_problem books of note published in the past decade, one, written by Mary Jane Sterling, from a well_known, popular brand of information books, which I'm unable to name here, stands out. The publisher has put a decent chunk of the book online at books.Google.com (go to books.google.com and search for sterling word problems). Striking Difference in Child Development _ If you are considering arranging extra math drills for your child, keep in mind that story problems are more like the real_life problems he or she will encounter, and, they help develop his or her critical_thinking skills. Children develop mental maturity like they do physical maturity. Think about the strikingly different mental development that ordinary math worksheets might foster in comparison to math word problems. Priorities _ Ordinary math worksheets certainly serve a purpose, but think carefully about the ratio of those to story problems when helping your child prioritize his or her available math study time.