5-1 Models of Addition

5-2 Zero and Opposites

5-3 Rules for Adding Positive and Negative Numbers

5-4 Combining Turns

5-5 Adding Positive and Negative Fractions

5-6 Adding Probabilities

5-7 The Commuatative and Associative Properties

5-8 Solving ax + b = c

5-9 Polygons

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