How to Calculate a Percentage Decrease (Formula and Examples)
Subtract the final value from the starting value, divide by the starting value, multiply by 100. The formula, worked examples and the mistakes that catch people out.
Maths teachers and tutors toolkit
Check an answer in seconds. Most of these calculators show their working too, so a student can see where their own method went a different way.
7 calculators in this toolkit
- Fraction CalculatorAdd, subtract, multiply or divide two fractions, with the working.
- Percentage CalculatorThe five common percentage questions in one tool.
- Ratio CalculatorSimplify a ratio, or solve one for a missing term.
- Mean Median Mode CalculatorThe averages of a list, with the working.
- Quadratic Equation CalculatorBoth roots of a quadratic, with the discriminant and working.
- Pythagorean Theorem CalculatorThe missing side of a right-angled triangle.
- Order of Operations CalculatorAn expression worked one PEMDAS (BIDMAS) step at a time.