Daft Dave did such a good job of the housing estate, he was asked to paint the room numbers on all of the doors of the fourth floor of the local hotel. He painted all of the numbers from 400 to 499. How many times did he paint the number 4?

How many squares, of any size, can be found on a standard chess board?

How many rectangles, of any size, can be found on a standard chess board?

Remember when counting the rectangles, that squares are also rectangles.

[Ref: ZLYW]

Hint: How many 8x8 squares are there, what about 7x7.

Answer: 1296 rectangles and 204 squares.

Puzzle 399

In this picture you can see 6 coins. Moving just ONE coin, can you form 2 lines, each with 4 coins?

[Ref: ZQLT]

Hint: Which one coin can you move? Try this puzzle with 6 coins of your own.

Answer: Simply move the right hand coin on top of the middle one.

Puzzle 400

Using the BrainTracker grid below, how many words can you find? Each word must contain the central D and no letter can be used twice, however, the letters do not have to be connected. Proper nouns are not allowed, however, plurals are. Can you find the nine letter word?