Rational number word problems

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Joelle is working on a school report in a word processor. She wants to place a figure which is 13.09 cm13.09 \text{ cm} wide so that it appears centered on the page. The width of the page is 21.59 cm21.59 \text{ cm}.
How much margin should she leave on the left so that the figure is centered?
 cm\text{ cm}