By pressing '–' twice and '+' five times, what floor does the lift reach if it starts at Floor 0?

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Q1.

What is the floor number above the ground floor labeled in Bela's Building of Fun?

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If you want to go from the ground floor to the Video Games shop, which button do you press?

Q3.

If you start at Floor +2 and go down to Floor 0, how many button presses do you make?

Q4.

How can you express pressing the lift button three times up?