The open exercise type is the default question type for exercises with mathematical answers. This can be numbers, variables, mathematical expressions like derivatives and intervals, equations, inequalities, etc. It supports multiple answer fields.
This exercise type can (but does not have to) contain variables. For more information about variables, see this article.
It is also possible to give tailored feedback on the student’s answer and to automatically grade this exercise type in a test. For more information on feedback and test usage, see this article.
A unique feature of open-type exercises is the possibility to add a Placeholder. This is a piece of text or a mathematical expression that is displayed in the answer field when the student loads the exercise. It can, for example, help the student by writing their answer using the right syntax. See an example below:
A Placeholder can be added by going to the “Texts” tab and clicking on “+Add” -> “... Placeholder”.
Placeholder texts should be written in LaTex using delimiters
#...#. To specify an input box in this text, the command
\box can be used. Note that the student can still delete the entire placeholder text and write a different answer if they want to.
If your school has access to SOWISO-made exercises, you should be able to find plenty of examples of open-type exercises in the author environment: