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MS Excel 2011 for Mac: Set up a cell to allow positive numbers

This Excel tutorial explains how to set up data validation to only allow positive numbers to be entered in the cell in Excel 2011 for Mac (with screenshots and step-by-step instructions).

Question: In Microsoft Excel 2011 for Mac, I want to set up a cell to only allow positive numbers. How can I do this?

Answer: Select the cells that you wish to restrict to a positive numbers. In this example, we've selected cells A2 to A6.

Select the Data tab in the toolbar at the top of the screen. Then click on the Validate drop-down and select Data Validation from the popup menu.

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When the Data Validation window appears, set up your criteria. In this example, we've setup the cells to allow a positive number.

Next, click on the Error Alert tab.

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Enter an Error message to appear when data entered does not conform to the validation rules.

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Now if a value is entered in one of those cells is not a positive number, the following error message will appear:

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