Exam-style question
Try this first
Explain what ordinal numbers describe. Then give the ordinal position of each object in the ordered set S = {"circle", "square", "triangle", "star"}.
Model answer
What a good answer should say
- Ordinal numbers describe the numerical positions of objects when the objects have been placed in order.
- In S, "circle" is 1st, "square" is 2nd, "triangle" is 3rd, and "star" is 4th.
Explanation
Why this works
The positions are found by reading the well-ordered set from left to right and assigning the first object 1st, the next object 2nd, and so on.
Common mistake
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