Job-Site Math

Tape-measure fractions, voltage drop, conduit fill, BTU sizing, and every worked example the American trades actually use — no theory, just the math the work demands.

The field companion for apprentices, DIY builders, and every tradesman who ever ran a number in the truck. Real situations, formulas laid bare, worked examples with nothing skipped, and a complete answer key. Every heavy formula also runs live on the free GSU Tool Bench, and GENO has memorized the whole book — free, 24/7, in 83 languages.

Kindle $3.99 · PDF always free