They can quickly see if they got a problem correct so they don’t waste time doing similar problems incorrectly!
As students do their homework, they can quickly see which problems they get right or wrong and get an updated grade.
If a student cannot figure out the correct answer, he or she can request to see the correct answer. This gives the student half credit.
Now the student is required to show how to solve the problem correctly, or the teacher can give zero credit for this problem.