the more you research teaching materials, the more you realize that the two are deeply connected. Seeing 3.6 as 3600 units of 0.001. Seeing 0.800 as 0.8. Neither is just a calculation technique.

The other day, I conducted a research lesson on the use of algebraic expressions with second-year junior high school students. I am truly grateful to be able to conduct research lessons every year. I ...