References

Cramer, K., Post, T., & del Mas, R. (2002). Initial fraction learning by fourth- and fifth-grade students: A comparison of the effect of using commercial curricula with the effects of using the rational number curriculum project curriculum. Journal of Research in Mathematics Education, 33 (2), 111-144.

Fuson, K. C. & Briars, D. J. (1990). Using a base-ten learning/teaching approach for first- and second-grade place value and multi-digit addition and subtraction. Journal for Research in Mathematics Education, 21 (3), 180-206.

Greeno, J. G. (1989). Some conjectures about number sense. In T. J. Sowder & B. P. Schappelle (Eds.), Establishing foundations for research on number sense and related topics: Report of a conference (pp. 43-56). San Diego: San Diego State University Center for Research in Mathematics and Science Education.

Kamii, C. (1989). Children Continue to Reinvent Arithmetic: Implications of Piaget's Theory. New York: Teachers College Press.

Markovits, Z., & Sowder, J. (1994). Developing number sense: An intervention study in grade 7. Journal for Research in Mathematics Education, 25, 4-29.

National Council of Teachers of Mathematics. (2000). Principles and Standards for School Mathematics. Reston, VA: Author.

Reys, B. J. (1994). Promoting number sense in the middle grades. Mathematics Teaching in the Middle School, 1 (2), 114-120.

Sowder, J. T. (1992). In G. Leinhardt, R. Putnam, & R. A. Hattrup (Eds.), Analysis of arithmetic for mathematics teaching (pp. 1-52). Hillsdale, NJ: Lawrence Erlbaum.

Van de Walle, J., & Watkins, K. B. (1993). Early development of number sense. In R. J. Jensen (Ed.), Research Ideas for the Classroom: Early Childhood Mathematics. New York: Macmillan.

Wheatley, G. and Reynolds, A. (1999). Coming to Know Numbers: A Mathematics Resource for Elementary School Teachers. Tallahassee, FL: Mathematics Learning Publishing Company.