Reflection: Connection to Prior Knowledge Adding Integers - What's the Rule? - Section 2: Explore

 

As I walked around the room, I heard one table struggling to determine if they were supposed to "really add or subtract the numbers."  I stopped and asked them the question, "if you were going to draw a picture of this problem, would you be able to cross any of the circles out?"  The students all responded yes, and when I asked why, they said "because there are some positive and some negatives."  So I said, okay, what operation reminds you of crossing things out, or getting rid of things?  They all said subtraction.  It seemed to then click for them and help them realize that crossing off circles is like subtracting, and you can only cross off circles if you have some of each (positive and negative).  Hopefully that will help them remember the rule!

  Instruction Reflection
  Connection to Prior Knowledge: Instruction Reflection
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Adding Integers - What's the Rule?

Unit 4: Operations with Rational Numbers
Lesson 4 of 23

Objective: Students will be able to develop a mathematical rule for adding integers, and apply the rule to solve problems.

Big Idea: Can you add without integer chips or a number line? In this lesson students will brainstorm properties of integer addition problems.

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