Grasple has multiple check methods using the Computer Algebra System (CAS) which can be used within the editor to indicate when the answer of a student should be marked correct/incorrect. A full list of current options can be found in this article.
This article covers the 'an Equivalent value, unit and precision as' check. There are two sections in this article:
When to use the 'an Equivalent value, unit and precision as' check?
How does the 'an Equivalent value, unit and precision as' check work?
When to use the 'an Equivalent value, unit and precision as' check?
You should use this check if you want to check whether a student answer describes the same unit expression as the (correct) answer. A simple example is 1 kilogram to be equal to 1 * 10^3 gram.
This check will check three properties of a unit expression:
The value the unit expression,
The quantity of the unit expression,
The precision of the unit expression (see this section on how this is determined)
The check will verify whether these properties are equivalent (see below for links to more details). If you want to make sure the given unit expression is exactly the same please see the the same Exact Value, unit and precision as check.
How does the 'an Equivalent value, unit and precision as' check work?
This check will consider two unit expressions to be equal to each other if all three properties are equivalent. This means that:
the values should be algebraically equivalent
the quantities should be considered equivalent
the precisions should be equal to each other
Questions or Feedback
Do you want to know more about this check, whether you should use it for your exercise or any of the other checks? Please let us know via the chat icon in the right bottom of the screen!