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.