Math ERROR
Casio Casio Calculator
Severity: MinorWhat Does This Error Mean?
Math ERROR on a Casio calculator means the result of a calculation is outside the valid range, or you gave a function an invalid input. Common causes: dividing by zero, square root of a negative number, or a result exceeding the display range. Check your input values.
Affected Models
- Casio fx-991EX
- Casio fx-991ES Plus
- Casio fx-82ES
- Casio fx-85GT
- Casio fx-9860GII
- Casio fx-CG50
Common Causes
- Division by zero
- Square root of a negative number (in Real mode)
- Logarithm of zero or a negative number
- Result exceeds the calculator's range (typically 10^100)
- Inverse trig function with argument outside -1 to 1
How to Fix It
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Press the right arrow key to review your expression and find the error.
On most Casio calculators, pressing the arrow key after an error lets you edit the expression. Look for division by zero or invalid function inputs.
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Check for division by zero in your expression.
Any expression that divides by zero (x/0) produces Math ERROR. Check that your denominator is not zero.
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For square roots of negatives: switch to Complex mode if available.
On the fx-991EX: MENU > Complex. This allows calculations with imaginary numbers.
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Press AC to clear the error and start fresh.
AC clears the current calculation and the error state. Re-enter your expression with corrected values.
Frequently Asked Questions
What is the number range of a Casio scientific calculator?
Most Casio scientific calculators handle numbers from 1 x 10^-99 to 9.999 x 10^99. Results outside this range produce Math ERROR.
Is Math ERROR different from Syntax ERROR?
Yes. Math ERROR means the expression is written correctly but the math is impossible (like dividing by zero). Syntax ERROR means the expression itself is written incorrectly (like missing a bracket).