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The student must write a number to 2 decimal places. The number has a trailing zero, and an alternative answer is used to detect when the student omits it. If the student omits the trailing zero, they're offered an optional hint.

A demonstration of the use of alternative answers to accept more than one correct answer. The student must write a number whose square is $n^2$. Both $n$ and $-n$ are accepted.

The student must calculate the number of digits a given decimal number would have when written in a different base. Alternative answers catch some common mal-rules and give appropriate feedback.

Based on table 2 from "diagnosing student errors in e-assessment questions" by Philip Walker, D. Rhys Gwynllyw and Karen L. Henderson.

The student is asked to identify the number of roots of a quadratic equation, and then to give the root or roots. There is a hint to calculate the discriminant, and then further hints with the formula for the discriminant and the decision to make based on its value.

This question demonstrates how you can offer a selection of hints, with each giving a different level of detail and applying a different penalty.

An interactive activity: the student enters the dimensions of a parcel, then has to calculate its volume, and classify its size by comparing against a table of maximum dimensions.

This question demonstrates how to lock a part in explore mode after moving to the next part, to prevent the student changing their answer and invalidating the rest of the question.

This question shows how to reveal a part if the student enters an incorrect answer that you're expecting - in this case, by not following the order of operations.

This question demonstrates how to use explore mode to simulate a game, where each choice made by the student changes the state of the game.

An example of an iterative procedure: the student must factorise a given number. At each step, they're asked if the number is factorised. If not, they must give a prime factor. If it is fully factorised, they can then work out the number of factors of the number.