Directed Numbers application

"Contour maps" give a good way to bring alive negative integers.
I Handed out a contour map to the class and had a short discussion. Then I asked students to make problems based on the map. They exchanged with peers and solved each other's problems. Exchanged notebooks back to be corrected. This was a difficult one, for many kids did not quite get the 'make the problems' part. :(
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