To apply conditional formatting, AutoCalculate must be enabled.
Click Tools | Cell Contents | AutoCalculate
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In your spreadsheet, select the cells to which you want to apply conditional formatting.
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Choose Format | Conditional Formatting
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On the Conditional Formatting dialog, enter the conditions.
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Note every condition has several aspects. The cell value is the option usually referred to when constructing a condition.
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The value in the cell will either be equal to, less than or greater than (and see the other options) to a certain condition. We will select less than in this example (see below)
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The condition is set in the third column - in this case we make the condition 40% (the boundary for a pass and fail)
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We then select the format that should be shown should the condition be met (the statement is TRUE). Click on New Style - the Cell Style popup window appears. In tis example we select a Background (clicked on the Background Tab) and select a red colour. Then Click OK and OK again.
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The conditional format rule is now applied and you can see the result (see right)