15. The Research Base
- The Role of Research
- The Nature of the Research Literature
- Research Findings By Chapter and Section
View author’s reference(s)
Author: Hart, K.
- Hart, K. (1988). Ratio and proportion. In J. Hiebert & M. Behr (Eds.),. Number concepts and operations in the middle grades. (pp. 198-219). Reston, VA: National Council of Teachers of Mathematics.