Exam-style question
Try this first
Define an irrational number and explain why √2 is an example.
Model answer
What a good answer should say
- An irrational number is a number that cannot be written as a fraction.
- √2 is an example of an irrational number because it cannot be written as a fraction.
Explanation
Why this works
A complete answer must give both the definition and the example's classification. It should link √2 to the defining property of irrational numbers: not being expressible as a fraction.
Common mistake
No common mistake is linked to this question yet.