Surface Area of a Cuboid: Subtraction or addition to a larger shape

Calculate the surface area of the shape in the diagram below.

342 cm2

To each wig of the box a cube was attached, with a side length of 3 cm.

Find the area of the surface of the shape:

$448\operatorname{cm}^2$

A number of bricks were stacked in the shape of a box. One brick was pulled out so that a brick-sized recess was left on its side.

Calculate the surface area of ​​the new shape.

79x + 83 cm²

An cuboid with a square hole is shown below.

Calculate the surface area of the shape.

279.5 cm².