# How to Make a Negative Sign With the TI-84 Plus ••• herlordship/iStock/GettyImages

Working with negative numbers is an important skill in math. Negative values are common with scales that go below zero, such as the Fahrenheit scale for temperature. You can treat a decreasing quantity as a negative increase. The TI-84 Plus, a graphing calculator, has a special key you use to enter a negative number.

Turn on the calculator by pressing the "ON" key in the bottom left corner.

Press the (-) key in the bottom right corner to make a negative sign. Be aware that the subtraction button does not work as a negative sign.

Enter a number using the keyboard. For example, pressing (-) and then 3 will display "-3," which corresponds to the value of negative three. You can make a number of any size a negative number.

Enter the rest of your calculation. You can use the same mathematical operations for negative values as you would with positive values.

#### Tips

• If you only have a basic calculator, look for a button with a "+" sign above a "-" sign, which is often between the 0 and the decimal point. Press this button before the number button to make it a negative number.