Four Fours/100/Solutions/2

Puzzle: Four Fours: $100$

Using exactly $4$ instances of the number $4$, the task is to write an expression for $100$, using whatever arithmetical operations you consider necessary.

Solution

$100 = \paren {\dfrac 4 {.4} }^{\tfrac 4 {\sqrt 4} }$

Sources

• 1980: Angela Dunn: Mathematical Bafflers (revised ed.) ... (previous) ... (next): $1$. Say it with Letters: Algebraic Amusements: Four Fours