In addition to alignment guides on a slide, you can align objects using vertical and horizontal gridlines that divide a slide into equal sections. As you drag an object around a slide canvas, it “snaps to” the gridlines whenever it aligns with one at its center or its edge, depending on your Object Alignment preferences; see Using Alignment and Relative Spacing Guides for details about setting these preferences.
You can make master gridlines appear in a different color from alignment and relative spacing guides so that it’s easier to know what is coming into alignment as you move objects around.
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Choose Keynote > Preferences, and then click Rulers.
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Select either or both of the horizontal and vertical Master Gridlines checkboxes.
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Type a percentage value in the field to specify how close together the gridlines should be.
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To change the color of gridlines, click the Master Gridlines color well and select a color in the Colors window.
To temporarily hide gridlines, hold down the Command key while you drag an object. Gridlines can be seen on the master slides but don’t appear on printed slides.
You can also have built-in alignment and relative spacing guides appear as you drag objects around the canvas, or create static alignment guides, to help you place objects in the same position on different slides. See Using Alignment and Relative Spacing Guides and Creating Your Own Alignment Guides.
Or specify x and y coordinates to place objects preicsely. See Positioning Objects by x and y Coordinates.