Math

Abacus: Getting Started with the Counting Method

By Debra Sewell

1.  Introduction

2.  Addition - No Exchange

3.  Addition - 4/5 Exchange

4.  Addition - 9/10 Exchange

5.  Addition - 49/50 Exchange

6.  Addition - 99/100 Exchange

7.  Subtraction - No Exchange, Exchange

8.  Subtraction - Intro to 4/5 Exchange

9.  Subtraction - Intro to 9/10 Exchange

10.  Subtraction - Intro to 49/50 Exchange

11.  Subtraction - Intro to 99/100 Exchange

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