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| Section 6.1, p. 201 The Number Zero Suggested URLs: For more information about the number zero see: | ||
| A history of Zero | ||
| For more information about the number zero ( http://www-groups.dcs.st-and.ac.uk/~history/HistTopics/Zero.html ) | ||
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| Section 6.1, p. 203 Factoring and Venn Diagrams | ||
| Factoring and Venn diagrams | ||
( http://www.shodor.org/interactivate/student.html ) | ||
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