Chapter Outline
1. Subtraction Operation – Difference
2. Diagram: 8-5
3. Subtraction Requirement
4. Negative Number
5. Diagram: 5-8
6. Mirror Image of Natural Numbers
7. Subtraction Diagram / Exercise
8. Number Line / Counters
9. 5 Digit Counters
10. Natural Numbers not Closed under Subtraction
11. Subtraction Table Exercise Instructions
12. Subtraction Table Exercise
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