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  • Addition with Help from the Number Line

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    Article on Addition with Help from the Number Line
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  • Subtraction with Help from the Number Line

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    Article on Subtraction with Help from the Number Line
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  • Addition and Subtraction (The Place-value System)

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    Article on Addition and Subtraction (The Place-value System)
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  • How to Subtract Using the Column Method

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    Article on How to Subtract Using the Column Method
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