This Addition Math workbook is a good challenge for your Kids to practice their facts over the summer.. It has plenty of timed test and gets more difficult front start to finish, to help Kids develop fluidity, build speed and accuracy in computation. You will notice that within a couple of weeks your kids went from taking 7-10 minutes to solve a page to 3-4 minutes, huge improvement. Also, it will help them memorize it too. Ask your Kid to solve problems with a pencil, so the book can be used over and over. Especially on pages he has trouble with.