Casio, based in Japan, manufactures personal electronics. The company was founded in 1946 and since then has become a household name for such things as electronic keyboards and calculators. In fact, Casio made the world's first hand-held, all-electric calculator in 1954. The FX 82 is a scientific calculator with a range of features. It can perform basic arithmetic computations, compute exponents and square roots, angle unit conversion, and trigonometric functions.

Select the mode of calculation you want to use. The FX 82 has three modes: press "Mode 1" for basic arithmetic, "Mode 2" for standard deviation, or "Mode 3" for regression analysis. You can access the set-up menu for each mode by pressing "Mode" twice.

Use the plus, minus, divide, and multiply keys for basic arithmetic. Press "Ans" to see the last answer. You can process up to 79 arithmetic operations at once. Use the arrow keys to move left and right to correct input errors.

Use the decimal features. The decimal-fraction calculator converts between decimals and fractions. Press "Shift" followed by "D/C" to change improper fractions to mixed numbers. Use the display settings to determine how you want fractions and decimals displayed.

Toggle the "Mode" key in trigonometric mode to toggle between degrees, radians and grads when measuring angles. You can compute sine, cosine, and tangent functions (and their inverses) by inputting the corresponding keys plus a numerical value.

Use standard deviation mode for standard deviation calculations. Press "Shift," "Clear" and the "1" key to clear out statistical memory before inputting values. Press "Shift S-Var" or "Shift S-Num" followed by a number to select sample standard deviation, population standard deviation, arithmetic mean, number of data or the sum of values.

Press the "AC" key or "Shift" followed by "CLR" if the calculator locks up. These commands clear out the present commands and allow you to start over.