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.

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