Task "Area"
In the piloting the students' responses to the task "Area" from diagnostic test 1 can be divided into 4 categories.
- Graph-as-picture error Some students made a graph-as-picture error and reasoned their answer just with the shape of the graph. A typical answer was: Because the drawing at the top looks exactly like the on I have circled.
- Graph-as-picture error Some students already argued with the area but they still took the shape into account. Typical answer: Because the area increases and then stays the same.
- Correct answer ... but wrong reasoning showed that the students did not interpret the diagram correctly.
- Correct answer Some students chose the correct diagram with an explanation as follows: Because the grey piece is getting bigger or similar answers.