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 Irrational Number:  A number whose decimal form is nonterminating and nonrepeating. Irrational numbers cannot be written in the form a/b, where a and b are integers (b cannot be zero). So all numbers that are not rational are irrational.

Rational or Irrational?: Determine whether ratios and fractions are rational or irrational.

Rationalize Pi: Approximate pi with a rational number.

Creating Integers: Explore the relationship between a fraction and its decimal equivalent.

The Life of a Natural Number: Determine the behavior of natural numbers given that even and odd numbers act differently.