Math & Education

Learn how to calculate GPA step by step: the 4.0 scale, credit hours, weighted vs unweighted GPA, cumulative GPA, and percentage conversion tables.

The arithmetic is trivial; the answer depends entirely on where you are standing. Tipping norms by country and situation.

The arithmetic is easy; the tactics around it are what cost money. Stacked offers, multi-buys, and how to check a claimed discount in seconds.

Volume formulas for cubes, cylinders, spheres and cones, worked examples, and the cubic-metres-to-litres step people forget.

Length times width covers most of it. The rest is a short formula table and a method for splitting awkward shapes into rectangles.