Puzzle 1
How many squares, of any size, are on a board divided up into 6 squares by 6 squares?
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answer
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Hint
How many 1 x 1 squares are there?
Answer
91 squares.
Reasoning
Squares of size:
1 x 1 = 36
2 x 2 = 25
3 x 3 = 16
4 x 4 = 9
5 x 5 = 4
6 x 6 = 1
Total = 36 + 25 + 16 + 9 + 4 + 1 = 91.
Puzzle 2
Can you find a word that can suffix (go after) each of these letters:
re
deva
rein
over
inter
under
Puzzle Copyright © Kevin Stone
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Hint
The missing word is five letters long.
Answer
State.
restate
devastate
reinstate
overstate
interstate
understate.
Puzzle 3
Moving from letter to letter using the moves of a chess knight, can you find the letters 'PUZZLES' in order?
Z
E
Z
S
Z
P
S
U
P
S
P
L
P
Z
S
U
L
U
U
E
U
E
E
P
U
S
U
P
P
Z
L
L
U
P
Z
Z
U
Z
S
U
L
P
E
P
Z
Z
E
L
U
Note: this puzzle is not interactive, and the squares cannot be clicked.
The moves of a knight are:
Puzzle Copyright © Kevin Stone
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Hint
It might be easier to find the S first.
Answer
Start with the P in the 5th row, 6th column:
Puzzle 4
What number comes next in the sequence:
11 · 13 · 17 · 31 · 37 · 71 · 73 · 79 · 97 · ?
Puzzle Copyright © Kevin Stone
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Hint
A very tricky puzzle involving prime numbers.
Answer
101.
These are prime numbers, which, when reversed, are also prime.
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