Mathematical Concepts
Every EPSO question tests a handful of mathematical concepts. If you struggle with a concept, every question that uses it becomes a coin flip. Master the concept, and those questions become free points.
How this helps your training
When you take practice exams, we track which questions you get wrong and map each error to the concepts involved. If you keep failing Weighted Average questions, we identify that your weakness is in averages and summation — and direct you here to review those specific concepts.
Fractions
A fraction represents a part of a whole. In EPSO, fractions appear every time you divide one number by another.
Percentages
A percentage is a fraction expressed out of 100. "Per cent" literally means "per hundred".
Division
Division is the most frequently tested operation in EPSO. Every ratio, percentage, and per-capita calculation requires division.
Exponents & Roots
Exponents describe repeated multiplication. Roots reverse exponents. Used in CAGR calculations.
Averages & Weighted Averages
A simple average treats all values equally. A weighted average gives more importance to some values than others.
Proportions & Scaling
Proportions compare two quantities and describe how they scale relative to each other.
Comparison & Ranking
Comparing values and identifying which is larger, smaller, or closest to a target.
Summation & Totals
Adding values to compute totals, subtotals, or aggregates from data tables.
Multiplication
Multiplication combines quantities. In EPSO, you multiply values by weights, populations by per-capita figures, or rates by bases.
Scaling
Scaling adjusts values proportionally. Used for unit conversion, population normalization, and size comparison.
Roots
Roots reverse exponents. The nth root undoes raising to the nth power. Essential for CAGR.
Exponential Growth
Each period builds on the previous total, not the original. This is compounding — the core of CAGR.
Time Value
The same growth rate produces different results depending on number of compounding periods.
Parts & Wholes
The relationship between a part and its whole. Foundation of all percentage calculations.
See how templates use these concepts
Each question template combines 2-4 mathematical concepts. Understanding the concepts makes the templates intuitive.
View Question Templates