Understanding

• Hiebert, J., Carpenter, T. P., & Fennema, E. (1997). Making sense: Teaching and learning mathematics with understanding. Portsmouth, NH: Heinemann.
  
• Upitis, R., Phillips, E., & Higginson, W. (1997). Creative mathematics: Exploring children's understanding. London: Routledge.
  
• Sierpinska, A. (1994). Understanding in mathematics. London: The Falmer Press.