Explanation of odd number plus an odd number equals an even number for all possible numbers (infinite numbers)

A young learner shares her concrete reasoning and justification for her proof. (1:18)

 

 

 

 

 

 

See teaching suggestions for reasoning and proof for why this is a major accomplishment for this student, teacher, and school.

 

 

 

 

 

 

 

 

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Dr. Robert Sweetland's notes
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