Technically correct...

[HansV]

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[Rudi]

That answer shows advanced understanding and goes beyond the required comprehension.
I'd score him/her double the points with those answers!

[HansV]

The pupil had probably seen What's the common factor?

[Rudi]

True.
Eileen's puzzle forum is more popular than any of us realize!

[stuck]

In days of yore when I was a school teacher, the staff used to swap any worksheets we'd prepared and then try to read them as the pupils might. Even so, there was alwys someone in the class that misread the sheet but once the child had explained there logic you had to agree with them, the wording could be interpreted that way after all

Ken

[ChrisGreaves]

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They need to join D.A..M.

Cheers
Chris