| Type |  Book |
| ชื่อเรื่อง | Developing essential understanding of addition and subtraction for teaching mathematics in prekindergarten-grade 2 / Janet H. Caldwell, Karen Karp, Jennifer M. Bay-Williams |
| ผู้แต่ง | Caldwell, Janet h |
| ISBN | 9780873536646 (pbk.) |
| | 9780873536646 pbk. 1,560 |
| พิมพลักษณ์ | Reston, VA : National Council of Teachers of Mathematics, c2011 |
| รูปเล่ม | x, 85 p. : ill. (some col.) |
| หัวเรื่อง | Addition --Study and teaching (Preschool) [] |
| | Addition --Study and teaching (Primary) [] |
| | Subtraction --Study and teaching (Preschool) [] |
| | Subtraction --Study and teaching (Primary) [] |