Range: 5 Mistakes to Avoid
Finds the spread between the largest and smallest value. The maths is not complicated, but a handful of errors come up again and again in this and related math & geometry calculations. Here is what to watch for.
Rounding is a common source of small errors. Keep full precision during intermediate steps and round only the final answer to the number of decimal places or significant figures the question asks for.
Calculators are best used to check working rather than replace it, especially for exams where method marks count. Work the problem by hand first, then confirm with the calculator.
1. Forgetting the order of operations
Powers and brackets come before multiplication and addition.
2. Using the wrong percentage base
A percentage change is measured against the original value, not the new one.
3. Dropping negative signs
Signs matter for roots, changes and differences.
4. Population versus sample formulas
Sample standard deviation divides by n − 1; population divides by n.
5. Rounding too early
Rounding intermediate steps can throw the final answer off.
The correct method
Range = max − min.
For example, with these inputs:
- Numbers (separated by commas): 12, 15, 9, 22, 15, 30
the calculator returns:
- Range: 21
Related calculations
- Exponent Calculator: Raises a number to a power.
- Logarithm Calculator: Calculates logarithms in any base.
- Quadratic Equation Solver: Solves ax² + bx + c = 0.
- Pythagorean Theorem Calculator: Finds the hypotenuse of a right triangle.
The Range Calculator applies the formula consistently, so it is a quick way to double-check your own working.
Run your own numbers: Range Calculator