To do simple airithmetic computations type the numbers into the field just below the toolbar. To start a calculation press :kbd:`enter` or press the :guilabel:`=` button. To add multiple numbers press :kbd:`+` or click the :guilabel:`+` button. To subtract two numbers press :kbd:`-` or click :guilabel:`-`. To multiply two numbers press :kbd:`*` or click :guilabel:`x`. To divide two numbers press :kbd:`/` or click the :guilabel:`/` button. To input decimals into Qalculate! type :kbd:`.` as the decimal point or click :guilabel:`.` To input the last answer you calculated click the :guilabel:`ANS` button. To delete the last character you typed press :kbd:`backspace` or click the :guilabel:`trash can` button. To clear all you have inputted left click the :guilabel:`Leftward pointing arrow with an x` button. To start doing an operation first use a parenthesis to do an operation first :kbd:`(` or click :guilabel:`(`. To close the operation you want to do first in order of operations use a close parenthesis so press :kbd:`)` or left click on :guilabel:`)`. To have both an open and close parentheses click the :guilabel:`(x)` button. If you have an error in your syntax an orange triangle will show up. To get more information on what your error is mouseover the orange triangle.
Below where you type in calculations is a history of your previous calculations. To go back in your history press the :kbd:`Down arrow` key. To go one step forward in your history press the :kbd:`Up arrow` key. To move the cursor one character to the left press the :kbd:`left arrow` key or left click the :guilabel:`left arrow`. To move the cursor one arrow to the right press the :kbd:`right arrow` key or left click the :guilabel:`right arrow` key. To move the cursor to the end press the :kbd:`End` key or right click the :guilabel:`right arrow` button. To move the cursor to the start press the :kbd:`Home` key or right click the :guilabel:`left arrow` button.
