Four Fours/40

Puzzle

Using exactly $4$ instances of the number $4$, the task is to write an expression for $40$, using whatever arithmetical operations you consider necessary.

Solutions

Solution $1$

$40 = \paren {4 + 4 + \sqrt 4} \times 4$

Solution $2$

$40 = 4! + 4! - 4 - 4$

Solution $3$

$40 = \dfrac {4!} {\sqrt 4} + 4! + 4$

Solution $4$

$40 = 44 - \sqrt 4 - \sqrt 4$

Solution $5$

$40 = 44 - \sqrt {4 \times 4}$

Also see

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