BrainBashers - Random Puzzles

Puzzle 1

How many squares of any size on this chessboard do not contain a rook?

Rooks On B3, C7, F5

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Puzzle 2

Place the digits 1 to 8, into the grid. The numbers you can see are the totals for the surrounding numbers.

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Puzzle 3

What four-letter word can be placed between the two following words to make two new words:
table[----]house

In the following example, the word 'book' creates the words 'cookbook' and 'bookcase'.
cook[book]case

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Puzzle 4

10
100
1,000
10,000

Which number comes after 10,000?

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