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Multiplication:-

Use the multiply button in the calculator keypad. Enter value1 press 'X' then enter value2 then press the equals '=' button key.

Division:-

Use the divide button in the calculator keypad. Enter value1 press Divide then enter value2 then the equals '=' key.

Addition:-

Use the addition button in the calculator keypad. Enter value1 press '+' then then the equals '=' key.

Subtraction:-

Use the subtraction button in the calculator keypad. Enter value1 press '-' then enter value2 then the equals '=' key.

Sin (sine) - Cos (cosine) - Tan

These are all immediate commands and will attempt to act on the immediate value contained within the readout.

Inv (Invert)

This button inverts Sin - Cos - Tan on the next Sin - Cos - Tan function.

Pi button

Inserts the current value of Pi (3.14159) into the readout overwriting the readout contents.

X² button

An immediate command and will attempt to square to the power two the immediate value within the readout overwriting the readout.

Xⁿ button

This will ask for a value (n) and will attempt to square the readout to the power (n) then place the value in the readout overwriting the readout.

1/x button

This will divide one by the contents of the readout then place the value in the readout overwriting the readout. 

Exp button

Inserts the exponential value 'E-' into the readout for the exponential function.

+/- button

Toggles any exponential function 'E-' to 'E+' etc within the readout, else negates any value contained within the readout. 

% button

Returns the percentage of the value of the readout, overwriting the readout.

Log button

Returns Log (e) , overwriting the readout.

Ln button

Returns Log (readout), overwriting the readout.

BS button

Back-space function for the readout.

CE button

Clear the calculator readout contents only.

CLR button

Clears all the calculator data areas except the stored memory data.