What is the calculator key for entering a negative number?

The calculator key for entering a negative number is usually the "(-)" or "NEG" button.

When you need to input a negative number on a calculator, look for a button labelled "(-)" or "NEG". This button is specifically designed to change the sign of a number from positive to negative. For example, if you want to enter -5, you would first press the "5" key and then press the "(-)" or "NEG" key. This will convert the 5 into -5 on the display.

It's important to note that the position and labelling of this key can vary depending on the make and model of your calculator. On some scientific calculators, the "(-)" button might be located near the bottom or to the side of the number keys. On graphing calculators, it might be found in a different section, often near the top or as a secondary function of another key.

Understanding how to input negative numbers is crucial for solving a variety of mathematical problems, including those involving algebra, trigonometry, and calculus. If you're ever unsure, refer to your calculator's manual or look for online tutorials specific to your calculator model. This will help you become more efficient and accurate in your calculations, which is essential for success in GCSE Maths.