Four Fours/18/Solutions/3

Puzzle: Four Fours: $18$

Using exactly $4$ instances of the number $4$, the task is to write an expression for $18$, using whatever arithmetical operations you consider necessary.

Solution

$18 = \dfrac {44} {\sqrt 4} - 4$

Sources

• 1964: L.H. Clarke: Fun with Figures ... (previous) ... (next): Solutions: $(46)$