The difference between "What is 731 minus 256?" and "Arrange the digits so that the difference is between 100 and 200" is massive. If you want to teach toward the end of the student-centered, higher-level thinking scale, use this book. Only 100 pages long, it is 100% practical - each math topic broken down by grade level, with sample questions. I plan to use these prompts as bellringers at the start of each math class. Fantastic. ( )