Four Fours/30
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Puzzle
Using exactly $4$ instances of the number $4$, the task is to write an expression for $30$, using whatever arithmetical operations you consider necessary.
Solutions
Solution $1$
- $30 = \dfrac 4 {.4} \times \sqrt {\dfrac 4 {. \dot 4} }$
Solution $2$
- $30 = 4 \times 4 \times \sqrt 4 - \sqrt 4$
Solution $3$
- $30 = 4! + 4 + 4 - \sqrt 4$
Solution $4$
- $30 = 4! + 4 \times \sqrt 4 - \sqrt 4$
Solution $5$
- $30 = 4! + \sqrt 4 + \sqrt 4 + \sqrt 4$
Solution $6$
- $30 = 4! + 4 + \dfrac 4 {\sqrt 4}$