Notes
1. "Standards for Mathematical Practice," Common Core State Standards Initiative, http://www.corestandards.org/Math/Practice/ (accessed June 21, 2014).
2. J.Storeygard, My Kids Can: Making Math Accessible to All Learners, 149-157.
3. "Common Core State Standards Unpacking," http://www.ncpublicschools.org/docs/acre/standards/common-core-tools/unpacking/math/2nd.pdf, (accessed July, 2014), 9.
4. "Standards for Mathematical Practice," Common Core State Standards Initiative, http://www.corestandards.org/Math/Practice/ (accessed June 21, 2014).
5. K.Richardson, Developing Number Concepts, 43
6. R.Howe, Three Pillars of First Grade Mathematics, 2.
7. "Common Addition and Subtraction Situations," https://www.engageny.org/file/3401/download/common_addition_and_subtraction_situations.pdf?token=H4FC8_TF0g8pL21wQ-DC7GoJHwg2Dpdabvu9OCZOQAY (accessed July 21, 2014).
8. S.Chapin and A. Johnson, Math Matters Understanding the Math You Teach, Grades K-8, 55.
9. T. Parker and S. Baldridge, Elementary Mathematics for Teachers, 47.
10. "Common Addition and Subtraction Situations," https://www.engageny.org/file/3401/download/common_addition_and_subtraction_situations.pdf?token=H4FC8_TF0g8pL21wQ-DC7GoJHwg2Dpdabvu9OCZOQAY (accessed July 21, 2014).
11. Investigations in number, data, and space.
12. Investigations in number, data, and space.
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