Primary Resources
Primary Resources: Doubling and Halving
Great teacher resources for helping students learn how to double or halve numbers quickly. Includes worksheets, PowerPoint presentations, and classroom games.
Alabama Learning Exchange
Alex: Why Do We Carry the One?
The students will critically think through the traditional algorithm for addition and compare to an alternative strategy.
ClassFlow
Class Flow: Estimation
[Free Registration/Login Required] After this lesson, students will be able to solve problems using a variety of mental math strategies.