To enter a number, you have to know whether or not you are in quick
numeric entry mode.
If you are in standard mode, first use an = sign. Xspread prompts you for
the expression on the top line. Enter the number or numeric expression.
If you are in quick numeric entry mode, start the numeric expression with
a digit (0-9), + sign, or - sign. Then, finish entering the number or
numeric expression.