How do your students determine whether a mathematical statement is true? Do they rely on a teacher, a textbook or various examples? How can you encourage them t

"A series for teaching mathematics."--P. [1] of cover.

What is the relationship between addition and subtraction? How do you know whether an algorithm will always work? Can you explain why order matters in subractio

Why do some equations have one solution, others two or even more solutions and some no solutions? Why do we sometimes need to ""switch"" the direction of an ine

How do composing and decomposing numbers connect with the properties of addition? Focus on the ideas that you need to thoroughly understand in order to teach wi