A Conversation for The H2G2 Puzzle Network

Puzzle 8 - Four Fours

Post 1

Icy North

OK, here's an interactive puzzle.

You have to construct a sum using four 4's (and no other numbers), to make successive integers.

I'll start you off by making 1:

(4+4)/(4+4) = 1

The next person to post will use four 4's to make 2, and so on.

There is no restriction on which mathematical functions and operators you use with the four 4's. You should easily be able to get up to 10 using only + - * / ( ) and square root - SQRT()

Let's see how high we can go...


Puzzle 8 - Four Fours

Post 2

Popa_Mintin


(4x4)/(4+4) = 2


Puzzle 8 - Four Fours

Post 3

Icy North

(4+4+4)/4 = 3


Puzzle 8 - Four Fours

Post 4

Popa_Mintin

- smiley - spacesmiley - space (Sqrt 4 + Sqrt 4) x (4 / 4) = 4


Puzzle 8 - Four Fours

Post 5

Popa_Mintin

- smiley - spacesmiley - space (Sqrt 4 + Sqrt 4) + (4 / 4) = 5


Puzzle 8 - Four Fours

Post 6

Popa_Mintin

- smiley - spacesmiley - space (Sqrt 4 + Sqrt 4) + (Sqrt 4) = 6


Puzzle 8 - Four Fours

Post 7

Icy North

That's disallowed, Popa. You must use all four 4's.


Puzzle 8 - Four Fours

Post 8

Popa_Mintin

- smiley - spacesmiley - space (4 + 4) - (4/4) = 7


Puzzle 8 - Four Fours

Post 9

Icy North

4*(4/4)+SQRT(4) = 6


Puzzle 8 - Four Fours

Post 10

Popa_Mintin

oops !

((4 + 4) / 4) + 4 = 6


Puzzle 8 - Four Fours

Post 11

Icy North

Yours is better


Puzzle 8 - Four Fours

Post 12

Popa_Mintin


((4 + 4) / 4) x 4 = 8


Puzzle 8 - Four Fours

Post 13

Popa_Mintin

smiley - spacesmiley - spacesmiley - biggrinsmiley - ta


Puzzle 8 - Four Fours

Post 14

Popa_Mintin

(4 / 4) +4+4 = 9


Puzzle 8 - Four Fours

Post 15

Icy North

(4+(4/4))*SQRT(4)=10


Puzzle 8 - Four Fours

Post 16

Icy North

Must dash now - good luck!

smiley - cheers Icy


Puzzle 8 - Four Fours

Post 17

Popa_Mintin


44 / (Sqrt 4) / (Sqrt 4) = 11


Puzzle 8 - Four Fours

Post 18

Popa_Mintin

4+4+(Sqrt 4)+(Sqrt 4) = 12


Puzzle 8 - Four Fours

Post 19

Popa_Mintin


(44 ÷ 4) + (Sqrt 4) = 13

4 + 4 + 4 +(Sqrt 4) = 14

(44 ÷ 4) + 4 = 15

4 + 4 + 4 + 4 = 16


Puzzle 8 - Four Fours

Post 20

Icy North

(4*4) + (4/4) = 17


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