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A pupils wrote 5 + 5 + 5 = 15 + 12 = 27. What to do about it?

Publication at Faculty of Mathematics and Physics, Faculty of Education |
2012

Abstract

A third grade pupil wrote the relationship given in the title when solving a word problem. He was not able to understand why his notation is wrong.

He perceived the notation as a process and not as a concept. His schoolmate, who read the notation backwards brought the boy to understanding the difference between process and concept.