It can be valuable for a student to review past work they have done and refresh themselves on the work they did to solve problems. Mathspace stores every step that a student has entered on any past task. Students can access these via Student Tasks.
If students click on 'Practice this problem again', they will get a similar question with different numbers, but the exact same procedure of solving it. This can play a powerful part in reinforcing students' knowledge.
Note: this will not impact any grades, and teachers are not able to view student work done in this way.