Can anybody help me understand why the areas in the schedule are different?

[giovanni.ar.chi.tect754720]

Hi.
I have the two photos of a schedule of takeoff quantities of 2 walls.
The small photo is schedule of parts.
Can anybody help me understand why the areas in the schedule are different and at the composite wall (straight with no angles) I cant find the result of the height moltiplicate the length? (At the simple, one component wall the result is straitforward).
42m2 and 82m2 how they have been calculated?
Thank you.

[giovanni.ar.chi.tect754720]

Sorry my mistake. I made the rounding in two decimal places and everything went ok.
Sorry about it.

[Wanderer]

Sorry my mistake. I made the rounding in two decimal places and everything went ok.
Sorry about it.

Thank you for taking the time to post back with your solution!