Not a lot of math, just key points.
As an explanation, key points are basically just specific steps on particular beats of the music. Based on execution (depth of blade etc.) and timing (right beat or not), teams get a Y (Yes), N (No) or T (timing) for each of the four key points. Usually, the number of Ys corresponds with the level (0 Y = base level, 1 Y = lvl 1, 2 Y = lvl 2, 3 Y = lvl 3 and 4 Y = lvl 4), with the first and third letter referring to the woman's key points and the second and fourth to the men's key points.