In our efforts to reform mathematics education, we've learned a tremendous amount about young students' strategies and the ways they construct knowledge, without fully understanding how to support such development over time. The Dutch do. So, funded by the National Science Foundation and ExxonMobil,[...]

CD-ROM developed by Maarten Dolk and Catherine Twomey Fosnot
Facilitator's Guide developed by Antonia Cameron, Sherrin B. Hersch, and Catherine Twomey Fosnot
In their series of professional books for teachers, "Young Mathematicians at Work," Catherine Twomey Fosnot and Maarten Dolk describe[...]

"Minilessons for Early Addition and Subtraction "is one of three yearlong resource guides in "Contexts for Learning Mathematics' Investigating Number Sense, Addition, and Subtraction" (K - 3) "Minilessons for Early Addition and Subtraction" is a resource of 78 minilessons that you can choose from th[...]

"Best Buys, Ratios, and Rates: Addition and Subtraction of Fractions "is one of five units in the "Contexts for Learning Mathematics' Investigating Fractions, Decimals, and Percents" (4 - 6) The focus of this unit is the development of equivalence of fractions, proportional reasoning, and rates. It [...]