A square sheet is folded left onto right and top onto bottom. Four holes are punched: one at the corner where the folds meet, one on each folded edge, and one in the middle. How many holes does the opened sheet have?

Question

Accepted Answer

9. The corner where both folds meet is the centre: 1 hole. A hole on one fold is copied only by the other fold: 2 each, 4. The middle hole goes through 4 layers: 4. Total 1 + 4 + 4 = 9 .

A square sheet is folded left onto right and top onto bottom. Four holes are punched: one at the corner where the folds meet, one on each folded edge, and one in the middle. How many holes does the opened sheet have?

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