Subtraction Problems

Subtraction does not work with the commutative property ... or does it? Confronted with a difficult problem, the narrator realizes that by writing the subtractions as adding a negative, he can rearrange the problem. Pupils learn that as long as they use addition to represent subtraction, they can reorder the problem to make the computations easier.

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CCSS: Adaptable
Additional Tags
Instructional Ideas
  • Provide opportunities for the class to practice several similar problems
Classroom Considerations
  • Individuals should know how to add and subtract integers
  • Expects students understand the distribution of a negative sign
  • This resource is only available on an unencrypted HTTP website. It should be fine for general use, but don’t use it to share any personally identifiable information
  • Uses a word problem as an example of the concept
  • Shows all of the intermediate steps in solving the problem
  • None