A paper strip has four squares numbered 1 to 4. Step 1: square 1 is folded under square 2. Step 2: square 4 is folded over onto square 3. Step 3: the 3-4 pile is folded under the 1-2 pile. Which numbered square is at the bottom of the final stack?

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4. After step 1 the left pile is 1 (bottom), 2 (top); after step 2 the right pile is 3, 4. Folding the right pile under turns it over, so its top square 4 ends up lowest: the stack from the bottom is 4, 3, 1, 2. Square 4 is at the bottom.

A paper strip has four squares numbered 1 to 4. Step 1: square 1 is folded under square 2. Step 2: square 4 is folded over onto square 3. Step 3: the 3-4 pile is folded under the 1-2 pile. Which numbered square is at the bottom of the final stack?

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