Parent can see the child's gradebook grades by first selecting the child's name from the top right corner drop-down list (in case there are multiple children associated to the same parent). Then, to view the child's assignment scores and few more related details, select Grades >> Gradebook Grades.
Here Parents can see the course, respective teacher assignment, total in percentage, letter grade, ungraded assignment count (if any) & the grade range in the class. Click on any course for the detailed view.
Clicking on each course would show up the assignments given with scores, percentage, letter grade, assigned & due date & the grade range in the class for that particular assignment.
Clicking on the Assignment would fetch a few more details about the assignment type & description.