Nelson EducationSchoolMathematics 5  
Lesson 5  Communicate About a Choice of Calculation Method
Adding and Subtracting Mentally  Use mental math strategies to add and subtract. Interactive Math Flashcards  Add and subtract using mental math strategies and paper and a pencil. Estimation Contraption  Use an estimation strategy to add the numbers before the time runs out. Estimating Sums by Rounding  Use an estimation strategy to find the sum of two numbers. Estimating Differences by Rounding  Use an estimation strategy to find the difference between two numbers. Adding Whole Numbers  Add the two numbers using paper and a pencil.

