Subdition is an innovative way of subtracting without borrowing or regrouping. There are three rules that govern Subdition that are very easy to comprehend. A) The Five Rule B) The Ten Rule C) The Traditional Rule The following PowerPoint presentation explains these rules and how and when to apply them.


  • Mathematics > Arithmetic
  • Education > General
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  • Mathematics > Number Sense & Operations

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Subtraction - Subdition



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Public - Available to anyone

License Deed:

Creative Commons Attribution Non-Commercial No Derivatives


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Curriki Rating
On a scale of 0 to 3
On a scale of 0 to 3

This resource was reviewed using the Curriki Review rubric and received an overall Curriki Review System rating of 3, as of 2013-06-28.

Component Ratings:

Technical Completeness: 3
Content Accuracy: 2
Appropriate Pedagogy: 0

Reviewer Comments:

This PowerPoint describes a different method for subtracting when borrowing or regrouping would be required, called Subdition. The PowerPoint provides step by step instructions and an example of three different rules. This resource could be improved with more examples of each rule as there are specific incidences when the rules are used and one example did not seem sufficient. Additional instruction by a teacher would be needed for students to understand this method of subtraction.
May 8, 2018

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