** Abacus Activities
- Abacus Editor Greetings / Mary Lou Kestell & Kathy Kubota-Zarivnij
- Research Summary - About Addition
- LET'S DO MATH: Conceptual Representations of Addition
- Math Manipulatives - Abacus
- Math Manipulatives - Rekenrek
- Links to Literature for Addtion / Pat Margerm
- LET'S DO MATH: Alternate Algorithms for Addition
- LET'S DO MATH: Mental Math Strategies for Addition
- Next Steps for Your Professional Learning - Application to Your Classroom
- Next Steps for Your Professional Learning - Suggested Readings