In his talk "A Lesson on Elementary, Worldly Wisdom," reprinted in Poor Charlie's Almanack, Munger argues that a handful of basic math models do most of the work in business thinking, and algebra is one of them.

"The Fermat/Pascal system is dramatically consonant with the way that the world works." — on probability, which he notes is just simple algebra Pascal and Fermat worked out in letters to each other

"You have to learn in a very usable way this very elementary math and use it routinely in life, just the way if you want to become a golfer you can't do it on merely a theoretical basis."

Harvard Business School built its "decision tree theory" by applying high school algebra to real problems, and students are "amazed to find that high school algebra works in life."

He also points to cost-benefit analysis, breakeven points, and quality-control math as things that look like specialized business jargon but reduce to elementary high school algebra. His warning: skip this and you're competing "like a one-legged man in an ass-kicking contest" against people who use it.

This app follows that thread. Modules 1 to 5 build the raw algebra skills. Modules 6 to 9 put them to work on breakeven analysis, comparing two business options, budget constraints, and compound interest, the exact territory Munger points to.