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.