1. Mathematical Module Addition

2. Describe as many different ways to solve the problem as possible. Try this:53 + 39 1. Mentally 2. Paper & Pencil 3. Eccentric Genius 4. Struggling Learner 5. Etcetera

3. Add Tens, Add Ones, Then Combine (symbolically)

4. Add on Tens, Then Add Ones (number line)

7. Move Some to Make Tens (number line)

10. Use a Nice Number and Compensate (number line)

16. Reflection Share with the class the ways you described to work the original problem. Which one, in your opinion, was the cleverest? Why? Of all the methods that you thought of and that were discussed in this presentation, which one(s) do you think would help struggling learners? Explain.

17. Reflection From this session, what did you glean about teaching, learning, or mathematics? As you interacted with this presentation, what other solution methods occurred to you? Describe and explain them no matter how slight or nuanced it might be. What were the differences and similarities between your mental computation and the pencil and paper method?