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4 pieces of A4 fit on one piece of A2.
a lot
You lift it up, carry it to the other piece of paper, and put it down.
Do you mean 'How many cats can you draw on a piece of paper'? It depends on your art style and how big you draw them So you mean, 'How many cats can stand/sit/lie on a piece of paper at once'? It depends on the size of the cats, and the size of the paper actually, any answer to your loose question depends on the size of the paper.
Two - A sheet of A4 paper is exactly half the size of a sheet of A3.
Well That really depends On how Big your writing is and How chunky your pen is
5 pieces
5 pieces
As many as you want. You can do anything if you set your mind to it. :)
The sluban pieces do fit with Lego pieces.
The cracks are so thin that a piece of paper can't fit through them.