Blog
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How to Work Out Percentages Without a Calculator
Master mental math strategies for working out percentages without a calculator — from the 10% building-block method to fraction shortcuts and estimation tricks.
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How to Calculate Percentage: Formula, Examples, and Shortcuts
Learn how to calculate percentage with the core formula, step-by-step examples, and mental-math shortcuts you can use anywhere.
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Percentage Difference vs. Percentage Change: What's the Difference?
Percentage difference and percentage change are not the same thing. Learn when to use each formula, see worked examples, and avoid the most common mistake.
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How to Calculate a Discount Percentage (and the Final Price)
Learn how to calculate discount percentages and final sale prices with step-by-step formulas, worked examples, and a quick reference for common discounts.
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Percentage Change Formula: How to Calculate Increase and Decrease
Master the percentage change formula for both increases and decreases. Includes step-by-step examples, a quick reference table, and common pitfalls.
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What Percentage Is X of Y? The Simple Formula Explained
Learn the one formula that answers 'what percentage is X of Y?' — with worked examples, a reference table, and tips for getting it right every time.