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May 26, 2016 at 11:01 comment added Martin Argerami -1. As I see it, since the issue is the kid's definition of "smaller"; imposing the "right" definition is not as good an approach as it would be to discuss what "smaller" means.
May 26, 2016 at 5:39 comment added Heisenberg I tried all the methods mentioned by you but nothing worked.
May 26, 2016 at 5:17 comment added Tommi Negative numbers as debt were understandable to kids in seventh grade, but I'm not sure when it becomes understandable. One kid has 3 €, another has 1 € of debt, third one has 9 € of debt. Who has the least money?
May 26, 2016 at 4:48 history answered Daniel R. Collins CC BY-SA 3.0