TY  - BOOK
AU  - Heddens, James W.
TI  - Today´s Mathematics : Concepts, Methods, and Classroom Activities
SN  - 978-0470-28690-6
U1  - 510 
PY  - 2009///
CY  - Estados Unidos 
PB  - Wiley
KW  - MATHEMATICS
N1  - Learning mathematics - Assessing mathematics - Technology in K-8 Mathematics - Addition and subtraction of whole numbers - Number theory and number systems - Rational numberss expressed as fractions: operations - Algebraic reasoning: Generalizing patterns and relationships
ER  -