Class 17, October 29, 2015 Lesson 3.2

 By the end of this lesson, you should understand that: ◦ Units can be used in dimensional analysis to set up calculations ◦ Precision should be based on several factors, including the size of the numbers used and the precision of the original numbers. Rounding can produce large differences in results

 By the end of this lesson, you should be able to: ◦ Solve a complex problem with multiple pieces of information and steps ◦ Use dimensional analysis ◦ Investigate how changing certain values affects the result of a calculation

 Main idea: ◦ All ratios have a common meaning, but they can represent different types of relationships  Main Idea: ◦ Units are important in problem solving  Main idea: ◦ It is important to consider the level of precision you use in making calculations

 Main idea: ◦ Questions about how one values affects another can be explored by using different values in a strategic and methodological way.  This is an important problem-solving skill