1. Week 3 What is wrong with saying 495 8 ? What is a proper way of writing this number in base 8? Suppose only 5 people can sit at a table, and there are only 5 tables in a classroom, and there are 5 classrooms in a building. How can this analogy be used to explain place value in base ___ if you have 203 students who need to sit down?

3. Agenda Class notes available in bookstore ($3.50). Make sure you have them by the class after the first exam. Don’t forget the goal: Moving from “able to do” a procedure to “able to understand” a procedure. Finish talking about different bases and number systems.

4. Agenda Moving on to addition! Homework-online! Be sure to check course web page often (I would bookmark the 302A page, not the assignment page. I don’t want you to miss any announcements!) Note: Exploration 2.9 continues on to next page; Part 3 #3cd on p. 45

5. Tell me what the number is in … Suppose I know that in base 10, a number is 401. Write it in Roman, Mayan, Egyptian, Babylonian, and Alphabitian. Now, write it in base 6. Now, write it in base 16. Now, write it in base 2.

6. 401 CDI CA0A

7. 401

8. Base 6:1505 Base 16:191 Base 2:110010001

9. Assignment Due Wednesday: Textbook: H5 15fh, 16gh, 17hj, 18dh, 25, 30a Note: On all problems Answer/Justify/Explain your strategy. You may use pictures or explanations to justify your work. Remember, we are emphasizing an understanding of the process, not just accomplishing the calculation.