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Primary Arithmetic: Part 4: Tens & Units

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Uploaded by on Aug 24, 2010

Introduction to arithmetic for young people and adults seeking a refresher course. In this Part, I show how to add numbers arranged in columns and how this addition is related to the answers obtained using the number table. Subtraction can also be made easily when the numbers are aligned. These operations lead directly to the idea that two-digit numbers consist of tens and units.

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