Casio FX-991EX Scientific Calculator, 552 Functions, Solar and Battery

Spreadsheet calculations

Useful for learning statistics. Up to 5 columns × 45 rows (maximum of 170 data items)

Matrix calculations

Perform calculations with matrices of up to 4 rows and 4 columns.

Vector calculations

Perform calculations using up to four third-order vectors stored in memory.

Multiline display

Formulas are automatically wrapped to multiple lines. *

*In linear input mode

Integration calculations

Perform integration calculations in advanced mathematics.

Differential calculations

Perform differential calculations in advanced mathematics.

Equation calculations

Calculation of simultaneous equations in 2 to 4 unknowns and high-degree equations of second to fourth degree

Inequality calculations

Solve second-degree to fourth-degree inequalities.

Advanced statistical distribution calculations

Perform calculations involving normal distributions, binomial distributions, and Poisson distributions.

Ratio calculations

Perform ratio calculations such as A:B=X:D.

Metric conversions

Select units from the Metric Conversion Command List.

Scientific constants

Select scientific constants from the Scientific Constant Table.

Variables list

One-touch list display

Statistics list

Displays six rows at once.

Digit separator

Separation every three digits makes even large numbers easy to read.

Engineering symbols

Perform engineering calculations that include symbols such as k, M, m, and n.