Getting ready to start teaching your mental math & double digit strategies units in 2nd grade? Each units (3) in this bundle provides you with a daily teaching presentation, independent practice for the students, and an assessment for the end of the unit.Presentations- 12 days of instruction to introduce adding and subtracting 3 digit numbers using the base ten, decompose, and number line strategies. There are enough slides each day to make sure you can model, practice together, and then al