Reflection: Gradual Release Adding and Subtracting Signed Decimals - Line Up Those Points! - Section 2: Explore


I try to steer away from the idea of me, we, two, you (gradual release) because I really feel it is the antithesis of common core.  I really feel like gradual release takes away the inquiry and natural thought processes of students.  That being said, gradual release was in full effect today :)  I had already taught this lesson to my advanced students, so I kind of knew what to expect in terms of misconceptions - the biggest misconception being that when you subtract you must take the number with the smaller absolute value from the number with the larger absolute value.  My advanced kids couldn't wrap their brain around that - at all.  So, going into this lesson - I modeled what really needs to happen to be successful with these problem types - specifically, I followed these steps: 1. Write the problem as an addition problem if it is not already; 2. Determine if you have the same signs or different signs, and then choose your operation accordingly; 3.  Look back at your signs and determine what the sign of your answer will be.  Since attention to detail is so crucial with these problems, I really felt like a concrete set of steps was important.  I found that as we moved past the instruction to the activity that students really did not require my help - which is good :)

  Instruction Reflection
  Gradual Release: Instruction Reflection
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Adding and Subtracting Signed Decimals - Line Up Those Points!

Unit 4: Operations with Rational Numbers
Lesson 16 of 23

Objective: Students will be able to add and subtract positive and negative decimals.

Big Idea: Everybody loves money – and it applies to all of our lives. Don’t get taken advantage of – learn how to work with positive and negative decimals in this lesson!

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adding and subtracting rational numbers
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