Discussion

A sheet of paper is shown below:

A net of six squares: a right-hand column of 1, 3, 5 from top to bottom and a left-hand column of 6, 4, 2 from top to bottom, with 6 beside 5

If the sheet is folded to form a closed box, which number will be on the opposite face of 6?

Answer: A

The face opposite 6 is 2.

In a cube net, two squares separated by exactly one square in a straight line become opposite faces when folded.

In the left column 6, 4, 2, the square 4 lies between 6 and 2, so 6 and 2 are opposite.
In the right column 1, 3, 5, the square 3 lies between 1 and 5, so 1 and 5 are opposite.
That leaves 3 and 4 as the third opposite pair.

5 is beside 6 in the net, so it becomes an adjacent face, and 3 and 4 also touch 6 once the net is folded.

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