Do you teach mental math? It can be a difficult thing for students to visualize in their heads. I have created a supplemental material for my 4th Grade Go Math! Series. It is a mental math cheat sheet that goes along with lesson 2.8. The 4 strategies that are used on this cheat sheet are: use friendly numbers, halving and doubling, addition, and subtraction. This product has been a lifesaver for my 4th graders! Enjoy!