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Learn Percentages

Fifteen short lessons, from what a percent is to compound growth.

Why Learn Percentages?

Percentages are one of the most widely used mathematical concepts in everyday life. From calculating a 20% tip at a restaurant to understanding a 3.5% mortgage rate, percentage skills directly impact your financial decisions.

Our 15 interactive lessons take you from the very basics — "What is a percentage?" — all the way through compound interest, investment returns, and business KPIs. Each lesson includes clear explanations, visual examples, and practice problems with instant feedback.

Your progress is saved locally, so you can learn at your own pace and pick up right where you left off. No account needed — just start learning.

  1. What is a Percentage?Understanding the basics of percentages and what they represent.
  2. Converting to PercentagesLearn to convert fractions and decimals to percentages.
  3. Finding Percentage of a NumberCalculate what X% of a number equals.
  4. Finding What Percent One Number is of AnotherDetermine what percentage one value is of another.
  5. Percentage IncreaseCalculate percentage increases and growth rates.
  6. Percentage DecreaseCalculate percentage decreases and discounts.
  7. Finding the Original ValueWork backwards from a percentage to find the original number.
  8. Compound PercentagesUnderstand successive percentage changes.
  9. Real-World ApplicationsApply percentage skills to shopping, finance, and more.
  10. Advanced ProblemsChallenge yourself with complex percentage scenarios.
  11. Simple & Compound InterestMaster interest rate calculations for savings and loans.
  12. Statistics & PercentilesUnderstand percentiles, quartiles, and statistical percentages.
  13. Investment Returns & ROICalculate return on investment and portfolio performance.
  14. Business Metrics & KPIsApply percentages to profit margins, conversion rates, and market share.
  15. Multi-Step Real-World ChallengesSolve complex problems combining multiple percentage concepts.