Guide For... - Thinking About Equations: A Practical

Using "Fermi questions" and simple physics to get ballpark figures.

Checking if an equation makes sense at extremes (e.g., zero or infinity).

It covers essential but often under-taught skills such as:

Using visual and geometric properties to simplify problems.

The book aims to help students move beyond just solving for a variable and instead learn to "interrogate" an equation. It provides a "toolbox" of techniques—reminiscent of Richard Feynman's famous "different box of tools"—to analyze, simplify, and verify mathematical expressions in a physical context.