Reflection: Developing a Conceptual Understanding Identify Related Facts - Day 1 of 2 - Section 3: Independent Practice


It was important to remind many of my students that the commutative property does not work for subtraction.  For example:  8+3 and 3+8 are related, however 8-3 and 3-8 are not related.  

Some students tended to get confused and tried to apply the commutative property to subtraction.  I had them use a model so that they could visually see that when we are dealing with related facts, we use the same three numbers, not just switch the signs around.

  Commutative Property and Subtraction Misconception
  Developing a Conceptual Understanding: Commutative Property and Subtraction Misconception
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Identify Related Facts - Day 1 of 2

Unit 1: Single Digit Addition and Subtraction
Lesson 3 of 12

Objective: SWBAT identify related addition and subtraction facts within 20.

Big Idea: It's all in the family! In this lesson, students will begin to identify and understand the relationship between addition and subtraction sentences.

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33 teachers like this lesson
Math, Number Sense and Operations, Operations , addition, subtraction, addition properties
  65 minutes
fact family sample 1
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