Educational Articles
In-depth articles on math, science, and finance.
Educational Articles — Learn the Concepts
These articles explain the mathematics, science, and finance behind our calculators. Each article includes definitions, formulas, worked examples, and links to tools that let you practice the concepts with real numbers.
Statistics & Data Analysis
Statistics quantifies uncertainty and variation in data. Key concepts covered in our articles:
- Standard deviation — measures spread around the mean; sample vs population formulas
- Z-scores — standardize values to compare across different scales
- Probability — classical probability, complements, and independence
- Permutations vs combinations — when order matters and when it doesn't
- Correlation vs causation — association does not prove cause
Physics & Chemistry
Physical sciences use formulas connecting measurable quantities. Our articles cover:
- Ohm's Law — V = IR for electrical circuits
- Density — ρ = m/V relating mass and volume
- pH scale — acidity measurement from hydrogen ion concentration
- Dilution equations — M₁V₁ = M₂V₂ for solution preparation
Finance & Business
Financial literacy articles explain how money grows, how loans work, and how to compare options:
- Compound interest — exponential growth of savings and investments
- EMI calculation — how monthly loan payments are computed
- Mortgage vs loan — key differences in terms and structure
How to Study With Articles
- Read the article and note the key formula
- Work through the example by hand
- Open the linked calculator and enter the same values
- Compare your manual answer with the calculator result
- Change one input and predict the new output before calculating