When you count to 20, you start at 1 (or zero) and count on until you reach 20. Each number is one more than the last. When you count back from 20, you start at 20 and count back until you reach 1 (or ...
The XBlock supports progressive grading and keeps progress across refreshes. All checking and record keeping is done on the server side. The following screenshot shows the Drag and Drop XBlock ...
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