Binary operations (adding, subtracting, multiplying, and dividing) are entered in the calculator as you would write them on paper. For example, to add 34 and 7 press

Unary operations (operations that require only one input) are also entered as you would write them. To find the square root of 25, press

To find the sine of press

To find log 100, press

The order of operations is programmed into the calculator. It performs the operations just as in algebra. The expression, 1 + 2 x 3 is calculated as 1 + (2 x 3). Since parentheses always have the highest priority, use extra parentheses whenever in doubt. The expressions (9 + 16)

The negative sign should not be confused with the subtraction sign. When subtracting two numbers use the key and when negating a number use the key.