@inbook {MATHEDUC.06656034,
author = {Graumann, G\"unter},
title = {Figures in a grid -- a problem field with different tasks for different grades.},
year = {2016},
booktitle = {Problem solving in mathematics education. Proceedings of the 2015 joint 17th conference of ProMath and the 2nd GDM working group on problem solving, University of Halle-Wittenberg, Germany, September 3--5, 2015},
isbn = {978-3-95987-012-2},
pages = {93-101},
publisher = {M\"unster: WTM-Verlag},
abstract = {Summary: Working within a problem field happens far too little. For stimulating the discussion one example will be described here with the problem field of figures in a grid in which one can find a lot of interesting problems. Already in primary school pupils can make several investigations by using a board with pins but also in secondary school from time to time one can treat a problem concerning only grid points. Here on one hand we will focus on searching for different triangles in a $3\times 3$-grid and on the other hand we will discuss the slopes of union lines of two points in an indefinite grid as well as angle measures between such two lines.},
msc2010 = {D50xx (G40xx)},
identifier = {2016f.00674},
}