Analysis: The square floor is paved with square tiles of the same size. The tiles on the two diagonal lines of the floor are all black. 10 1 black tiles. According to the special properties of a square, each side of the square has (101+1) ÷ 2 = 51.

To solve this problem, we must make full use of the special properties of squares. The number of tiles on the diagonal equals the number of tiles on each side.

Answer: According to the meaning of the question, each side of a square has (101+1) ÷ 2 = 51tile.

So the total number is: 51× 51= 2601(block).

So the white one is 260 1-5 1=2500 (block).

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