Exam-style question
Try this first
Which pairing correctly matches each value to its use?.
- A.Number of chairs: natural number; room width: real number
- B.Number of chairs: real number; room width: natural number
- C.Number of chairs: real number; room width: real number only when it is a whole number
- D.Number of chairs: natural number only when the room width is a fraction
Model answer
What a good answer should say
- Number of chairs: natural number; room width: real number
Explanation
Why this works
The number of chairs is a count, so a natural number is suitable. The room width is a measurement, so a real number is suitable, including when the measurement has a fractional part.
Common mistake
No common mistake is linked to this question yet.