Notes
1. R. Howe, Taking Place Value Seriously, 3.
2. R. Howe, Taking Place Value Seriously, 5.
3. R. Howe, Taking Place Value Seriously, 3.
4. R. Howe, Taking Place Value Seriously, 3.
5. L. Ma, Knowing and Teaching Elementary Mathematics, 1-27.
6. D.C. Geary, Children's Mathematical Development, 67.
7. http://www.dictionary.com
8. http://www.dictionary.com
9. R. Howe, Taking Place Value Seriously, 4.
10. R. Howe, Taking Place Value Seriously, 27-30.
11. M. Burns, About Teaching Mathematics, 75.
12. Singapore Primary Math Texts, Curriculum Planning & Development Division, Ministry of Education, Singapore, vol. 1A, 5.
13. D.C. Geary, Children's Mathematical Development, 44-46.
14. Commonwealth of Virginia, Board of Education, Standards of Learning, http://www.doe.virginia.gov/VDOE/Superintendent/Sols/math2.pdf
15. National Council of Teachers of Mathematics. (2000) Principles and standards for school mathematics. Reston, VA: National Council of Teachers of Mathematics.
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