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Understanding Fact Families with Addition and Subtraction Facts

In this lesson, we explore fact families using the numbers 3, 9, and 12. A fact family consists of related addition and subtraction sentences that use the same numbers. For our family, the addition facts are 3 + 9 = 12 and 9 + 3 = 12. The corresponding subtraction facts are 12 - 3 = 9 and 12 - 9 = 3. By mastering these four math sentences, you enhance your understanding of how addition and subtraction are interconnected within a fact family.

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Understanding Fact Families with Addition and Subtraction Facts

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Presentation Transcript

  1. Chocolate Fact Family

  2. 3 9 12These are the numbers for our fact family.

  3. These are the two addition facts:3 + 9 = 129 + 3 = 12

  4. These are the two subtraction facts:12 – 3 = 912 – 9 = 3

  5. Now you have learned of the four math sentences needed for a fact family.

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