Lesson Plan

Developing Strategies for Addition and Subtraction

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Assessment Anchors

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Big Ideas

Concepts

Competencies

Objectives

Students will develop number sense by composing and decomposing numbers and using various strategies to learn basic number facts. Students will:

  • use their understanding of number combinations to develop fluency in the use of basic facts for addition and subtraction.

  • use strategies to generate addition and subtraction facts including making tens, fact families, doubles, plus or minus one, counting on, counting back, and the commutative and associative properties. Use the relationship between addition and subtraction to generate basic facts.

  • develop and use strategies for solving simple story problems, including problems with money.


Essential Questions

  • What strategies and models can we use to understand how to solve an addition or subtraction problem?


Vocabulary

  • Associative Property: A property of addition or multiplication in which the regrouping of the addends or factors does not change the outcome of the operations [i.e., (a + b) + c = a + (b + c) and (ab)c = a(bc)].

  • Commutative Property: A property of addition or multiplication in which the sum or product stays the same when the order of the addends or factors is changed (i.e., a + b = b + a and ab = ba).

  • Fact family: A set of related addition and subtraction, or multiplication and division equations using the same numbers (e.g., 6 + 9 = 15, 15 − 9 = 6,
    9 + 6 = 15, 15 − 6 = 9). [IS.1 - All Students]


Duration

90–120 minutes [IS.2 - All Students]


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