Guinness World Records® Math, Grade 4

These books (I've used them for several grade levels...for Reading and Math) are perfect for individualized instruction. There is a skill matrix in the front, so you can customize the reading selections according to the student's needs. There are five or six math-related questions over the reading material; if you're using the Reading text, there are also enrichment activities included. I tutor elementary students over the summer, and will be buying these again next summer! Oh, and FYI: the world's largest spider has a leg span of 11 inches!