Additional, optional homework, offered mostly in certain high school courses. Extra credit gives students a chance to raise their grade, as any extra points awarded for doing the work are not given on a percentage scale. In other words, A student who completes 75 points of a 100-point homework assignment, then does 10 points of extra credit, ends up with a grade of 85% (B), instead of 85/110 = 77% (C+).