📚 Free Educational Guides
Learning Hub
Teacher-style guides explaining how the world teaches and calculates maths — and plain-English explanations of how every calculation actually works.
🌏 Math Around the World
Compare all 10 →Why does Singapore top the PISA charts? Why does Finland ban tests until age 16? How does Vedic math let Indian students multiply 97 × 98 in seconds? Each country has a radically different philosophy.
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Singapore
The #1 PISA method
China
Shanghai method & 万 counting
Japan
Hatsumon & structured problem-solving
South Korea
Hagwon culture & intense drilling
Finland
Play-based, no tests until 16
India
Vedic math & lakh/crore system
Germany
Strict curriculum & European notation
France
Grandes Écoles & proof culture
UK
BODMAS, GCSE & A-Level pathway
USA
Common Core & PEMDAS
Compare All 10
PISA ranks, methods, age, calculator policy
📖 How to Calculate
All guides →Plain-English step-by-step explanations for every major topic. Each guide shows the formula, a worked example with real numbers, and how the method or answer varies by country.
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How to Calculate Percentages
Percentage of, percentage change, reverse percentage — with worked examples
How to Calculate BMI
WHO formula, country thresholds (Japan, Asia-Pacific, China), step by step
How to Calculate Compound Interest
Daily, monthly, annual compounding — the formula explained simply
How to Calculate Mortgage Payments
P&I formula, amortization, US vs UK vs Canada differences
Mean, Median, Mode & Standard Deviation
Statistics basics — when to use which, with real examples
How to Calculate with Fractions & Decimals
Add, subtract, multiply, divide fractions. Convert to/from decimals
How to Calculate Area & Perimeter
Squares, rectangles, circles, triangles — formulas and worked examples
How to Calculate Volume
Cubes, cylinders, spheres, cones — step-by-step with real numbers
How to Calculate Ratios & Proportions
Simplify ratios, solve proportions, scale recipes and maps
Order of Operations: PEMDAS vs BODMAS
Which country uses which acronym — and why the answer is always the same
Mental Math Tricks from Around the World
Vedic multiplication, Japanese soroban, Chinese cross-multiplication
Reading Large Numbers by Country
Million/billion vs lakh/crore vs 万/億 — how the world counts big numbers
Featured Guide
How Countries Calculate Differently
Why does Europe write 1.234,56 instead of 1,234.56? Why does Japan have no word for million? The definitive guide to international number, date, and measurement differences.