Addition and Subtraction to 20

Unit Review Sheet

Facts and Definitions

Lesson 1: Addition and Subtraction Review

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Lesson 2: More About Addition

• Addend: a number being added to another number or other numbers
• Sum: the total when numbers are added together
• Associative property of addition: math law that states that when adding more than 2 numbers together the order or grouping of numbers does not matter

Lesson 3: Adding to 20

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Lesson 4: More Adding to 20

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Lesson 5: Addition Games and Crafts

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Lesson 6: Subtracting Within 20

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Lesson 7: Problem Solving

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Final Project: Numbers Are Missing!

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