To find the least amount of wrapping paper needed, you will find the surface area of the rectangular prism.
These are the areas of all the faces.
Top/Bottom: 8 x 8 = 64 in.²
Front/Back. 8 x 10 = 80 in.²
Left Side/Right Side: 8 x 10 = 80 in.²
(64 x 2) + (80 x 2) + (80 x 2) =
448 in.²
The least amount of wrapping paper needed is 448 in.².