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Strategies for adding and subtracting within 100

Learn to add and subtract within 100

Learn to add 2 digit-numbers by making tens #1
How to add 2 digit-numbers by making tens
Learn to add 2 digit-numbers by making tens #2
How to add 2 digit-numbers by making tens
Learn to select strategies for adding within 100
How to select strategies for adding within 100

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