Four Fours/80
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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 $4$
- $80 = 4 \times \paren {4 \times 4 + 4}$