Reflection: Relevance Compensating to Compute Larger Numbers - Section 3: Student Practice


During independent practice time, most students were very successful with addition portion of the practice pages: Compensating Addition Problems Successfully.

When subtracting, most students were quite comfortable with adjusting the minuend or subtrahend by adding or subtracting a number to get "nicer" numbers to work with. However, some students struggled with knowing if they should add this number back in or subtract it.

I would often explain the problem using a simple bake sale scenario to build relevance: Let's say we are having a bake sale. I have 4,506 cookies and I sell 3,298 cookies. If I "take away" only 3,200, should I add 98 cookies or subtract 98 more? Here's an example of this conference: Bake Sale Conference.

  Relevance: Reflection
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Compensating to Compute Larger Numbers

Unit 5: Adding & Subtracting Large Numbers
Lesson 12 of 16

Objective: SWBAT use compensation to check the addition and subtraction algorithms for accuracy.

Big Idea: Students will make numbers friendlier before computing and will compensate the answer later on.

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Math, Number Sense and Operations, checking for accuracy, compensation, decomposition
  95 minutes
compensating by subtracting 1 027
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