Exam-style question
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Which statement best describes an irrational number?.
- A.A number that is always negative
- B.A number that cannot be written as a fraction
- C.A number that is always greater than one
- D.A number that cannot be used in a calculation
Model answer
What a good answer should say
- A number that cannot be written as a fraction
Explanation
Why this works
An irrational number is defined as a number that cannot be written as a fraction.
Common mistake
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