I didn't see that but, before teaching, I spend many years in it as did my father.
To build a house, it would be impossible without a working knowledge of basic math and Geometry.
1: Start by laying out the foundation - must understand 3/4/5 to square it
2: To pour concrete, you must be able to calculate volume
3: To layout outside walls, you must be able to understand 16" centers and "inside" versus "outside" 4 foot spacing.
4: To calculate rafters, one must be able to understand Pythagarean ...
etc, etc, etc...
I suggest you get a guest contractor to give your class a visit - he will impress them in the need of this math.