Four Fours/64/Solutions/1
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Puzzle: Four Fours: $64$
Using exactly $4$ instances of the number $4$, the task is to write an expression for $64$, using whatever arithmetical operations you consider necessary.
Solution
- $64 = \paren {4 + 4} \times \paren {4 + 4}$
Sources
- 1968: Henry Ernest Dudeney: 536 Puzzles & Curious Problems ... (previous) ... (next): Answers: $109$. The Two Fours