Reflection: Joy How Addition and Subtraction are Related (Part 2 of 3) - Section 2: Problem Solving & Questions


There are some students who prefer the counter model over the number line.  Some of these students showed up during this lesson.  I could hear it in the "ohs and ahs" that I would hear around the room.  These students, like me, think it is really cool how the connection between subtraction and addition can be seen using red and black counters.  The procedure for using the counters to illuminate the relationship can be a bit strange.  To solve 4 - 2 why not just remove 2 black counters?  But of course, the point is not to subtract integers but to see how they relate to addition and subtraction.

  Those Who Love the Counter Model
  Joy: Those Who Love the Counter Model
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How Addition and Subtraction are Related (Part 2 of 3)

Unit 1: Rational Number Operations
Lesson 8 of 27

Objective: SWBAT write a difference as a sum using counters as a model

Big Idea: Students will use counters to prove that a difference can be written as a sum.

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Math, Number Sense and Operations, Additive inverse, add the opposite, rational numbers
  50 minutes
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