This evaluation type checks if the second operator in the Definition field is present in the first operator of the answer. i.e. times,plus checks whether there is a multiplication that has a plus as a descendant in the student’s answer. Example:
The second argument in the Definition can be a list, where multiple symbols can be searched with an OR. For example, the following rule checks whether there is a division that has a plus or a minus as a descendant.
An optional third argument in the Definition specifies the position of the child. For example, the following rule checks whether the denominator (and not the numerator) of a fraction has a plus or a minus in it.
Moreover, this rule checks whether the base of the power (and not the exponent) has a plus in it:
And lastly, this rule checks whether there is a plus sign in the left argument of a multiplication:
Note: if your feedback rule doesn’t seem to work for some reason, try deleting any spaces in the feedback Definition.
Automated feedback
Below are some examples of what the automated feedback of this evaluation type looks like:
More on evaluation types
An overview of all evaluation types can be found here (for mathematical answers) and here (for text-based answers). More detail on the different fields of a feedback rule can be found here.