2Foundations for Success.The.Final Report of the National Mathematics Advisory Panel[]..2008
3Liping Ma.Knowing and Teaching Elementary Mathematics:Teachers‘ Understanding of Fundamental Mathematics in China and the United States[].Studies in Mathematical Thinking and Learning.2000
4TIMSS 1999 International Mathematics Report[R/OL]. http://timss. bc.edu/timss1999i/publications.html . 2009
5National Mathematics Advisory Panel.Foundations for Success:The Final Report of the National Mathematics Advisory Panel[].wwwedgov/MathPanel.2008
