Test
Number sets and real numbers
Dynamic tasks on natural, integer, rational, irrational and real number sets, intervals and subsets.
Time left: 00:00:00
Sample questions
- What is the smallest listed number set containing ___?
- What is the smallest listed set containing √___?
- What is the smallest listed set containing the fraction ___/___?
- Which inclusion relationship between number sets is correct?
- Does ___ belong to the interval [___, ___)?
Number sets and real numbers
Natural numbers form a subset of the integers, integers form a subset of the rational numbers, and rational together with irrational numbers form the real numbers. A rational number can be written as a/b, where a and b are integers and b ≠ 0.
Sets and intervals
A terminating or recurring decimal is rational, while numbers such as √2 and π are irrational. Interval brackets show whether an endpoint is included. Choose the smallest set containing a number, and distinguish membership ∈ from the subset relation ⊂.
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