Venn Diagram - Number System: ![\"venn](\"http://www.mathskey.com/userfiles/image/Library/Algebra%202/venn_diagram_number_properties%281%29.gif\")
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
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The number is 0.
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Observe the Venn Diagram:
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- The number 0 is a whole number (W).
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- The number 0 is a integer number (Z).
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- The set of whole numbers (W) and integers (Z) are subsets of rational numbers (Q).
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- All rational numbers (Q) are real numbers (R).
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![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
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The number 0 belongs to W, Z, Q, and R.