On the first day of school I started putting a challenging math problem on the window of my classroom for students to solve. What started with 1 student, slowly grew into 10-20 students coming everyday to solve the new problem.There are 10 categories of Number Sense problems ranging from 1 to 5 star difficulty level.These 50 Problems come from the Middle School and High School Versions of Big Brain Math Problems. This slideshow was created by myself and 2 of those students who have put count