Sizu Riatto · Math Workbooks
Every workbook here teaches the arithmetic by hand, and stands complete on its own. These free tools are the bonus layer — they do the same math in one click, and hand you blank templates to print and reuse.
Enter your own numbers and get the figure the book taught you to work out — the monthly loan payment, the real unit price, the compound growth, the budget bottom line. Each one cites the chapter it comes from, so it reinforces the book rather than replacing it.
Every reusable tool from a book, gathered into one printable PDF and sized for your printer. Run a fresh copy whenever a new bill, payslip, or month arrives. No sign-up, no email — just the templates.
Practice-first paperbacks. Each book page lists every chapter, links its calculators, and offers its printable toolkit. Pick the book you're reading.
Practice problems that actually come up in life — receipts, recipes, rent, tips, deals, and the math you meet on ordinary days.
Budgeting, interest & the money numbers you actually use — paycheck, savings, debt payoff, smart spending, and taxes without the panic.
Cooking, scaling & the numbers in every recipe — kitchen fractions, cup-to-gram conversions, recipe scaling, nutrition labels, and timing a whole meal.
Beds, soil, spacing & the numbers that grow food — bed area, cubic yards of soil, plant counts, harvest yields, frost dates, and pots on a balcony.
Pricing, margins, payroll & the numbers at work — markup vs. margin, percentage change, break-even, payslips and invoices, charts that bend the truth, and ROI.
Compare any two prices, see through a “sale,” and know what a deal is really worth.
Read your payslip, understand gross-to-net, and check you were actually paid right.
Read any utility bill, compare tariffs, and catch overcharges before you pay.
See what borrowing really costs — the monthly, the total interest, the amortization schedule.
Watch compound interest work, use the rule of 72, and weigh the real cost of waiting.
Put every money number on one page and see exactly where it all goes.
Price for profit, find your break-even, and keep more of what you earn — for makers and sellers.
Know your real hourly, skip the money traps, and decide what's actually worth it — for the day-jobber earning on the side.
Read a P&L, balance sheet, and cash flow statement in plain English — a beginner's detective casebook for the three financial statements.
Catch the lies inside the numbers — ten real collapses decoded (Enron, Wirecard, Luckin, WorldCom, Madoff…) and the tells that gave each one away.
Turn a detective's eye on your own money — bank statements, payslip, invoices, and deals. Eight real cases; one twenty-minute-a-week habit.
Build a real sideboard from one sheet of plywood — board feet, kerf-aware cut lists, squaring, joints by proportion, mitres, compound angles, sag, and the surface.
Count the milliamps. Size a battery-powered sensor to last a year before you build it — Ohm's law, battery budgets, sensors, duty cycles and the one datasheet line that turns 375 days into 16.
Weigh it, scale it, time it. Baker's percentage, hydration, sourdough and lamination in plain English — and one bake day of focaccia, ciabatta, sourdough and croissants, all from plants and all from formulas you wrote.
Take one bare room and finish it — paint, flooring, insulation, plaster, skirting, doors and windows, all measured, ordered, costed and checked against a builder's quote.
The weekend builder's math, from the first string line to a low flood wall. Count it, set it out, pour the footing, lay it, check it and finish it — then build a six-meter garden wall, or plan a low flood wall with the right professional.
The weekend builder's math for posts, pickets, privacy boards and a gate that stays square, on flat ground or a slope. Count the bays, set out the line, dig and pour, choose the fence, space the pickets, rack or step it, check the wind, hang the gate and stain it.
Not workbooks. These nine are read, not drilled: each one explains an idea from the start, in plain English, and sends you to the workbooks above when you want practice.
The ancient thinking tools they forgot to teach you. Zero, negative numbers, fractions, algebra and statistics, each started from the person who needed it. 19 chapters, no exercises to dread.
Clear thinking for everyday life, in plain English with no symbols. For everyone who knew they were right but couldn’t explain why.
The simple sums behind prices, pay, bills, loans and savings, explained for reading. Now on Kindle.
Averages, spread, polls, p-values and correlation, explained for reading, with 107 worked examples and 13 new free calculators. Now on Kindle.
Margins, break-even, cash flow and the P&L, explained for reading, with 127 worked examples and free calculators. On Kindle now.
Coincidences, odds, streaks, lotteries, insurance and risk, explained for reading, with 143 worked examples and free calculators. On Kindle now.
The grown-up refresher: why the rules work, how to do them in your head, and where you’ll use them, with 162 worked examples and free calculators. On Kindle now.
A parent’s plain-English guide to number bonds, number lines, the area model, bar models and every method your child brings home, with 169 worked examples, free tools and printables. On Kindle now.
Roughly right in a minute: size up any number, check any claim and answer questions nobody can look up, with 153 worked examples and free calculators. Coming soon to Kindle.
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