Mental Math and Reflexes in the EM book are a wonderful way to warm up for the math lesson and review previously learned topics. The mental math problems are always leveled with stars (1, 2, 3) that increase in difficulty. In my classroom, the students create a MMR folder that they keep in their desk. Then each day before the lesson starts, they take out their MMR folder and complete the lesson of the day. These are the MMR lessons for Unit 2 in Everyday Math 2012 4th Grade.