Four Fours/80

Puzzle

Using exactly $4$ instances of the number $4$, the task is to write an expression for $80$, using whatever arithmetical operations you consider necessary.

Solutions

Solution $1$

$80 = \dfrac 4 {.4} \times \paren {4 + 4}$

Solution $2$

$80 = \dfrac {4!} {. \dot 4} + 4! + \sqrt 4$

Solution $3$

$80 = \dfrac {4!} {.4} + 4! - 4$

Solution $4$

$80 = 4 \times \paren {4 \times 4 + 4}$

Also see

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