Algebra 2 Algebraic Manipulation Choose a two-digit number with two different digits (e.g. 47) and form its reversal (i.e. 74). Now, subtract the sum of the digits from each of these numbers, and then add the two results. Show that you ALWAYS obtain a multiple of 9. Functions and Expressions ...| Google Docs
Frank Cassano and Anya Sturm are math teachers at Marin Academy, an independent high school in San Rafael. They presented on “Integrating Argumentation and Problem-Solving” at the Calif…| Henri's Math Education Blog