📊 Math Guides
Percentage Formulas Made Simple
Every percentage calculation you need — increase, decrease, difference, and X% of Y — with formulas and worked examples.
4 guides · All with examples
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Calculate Percentage Increase
The formula for growth: ((new − old) ÷ old) × 100. Three worked examples.
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Calculate Percentage Decrease
The mirror formula for drops, discounts, and reductions — with examples.
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Calculate X% of a Number
The most basic percentage skill. Includes mental math shortcuts.
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Calculate Percentage Difference
Compare two numbers using their average as the base. How it differs from percentage change.
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