1. State the problem: Evaluate $3\sqrt{64}$.
2. Use the rule for perfect squares: $\sqrt{64}=8$ because $8^2=64$.
3. Substitute and multiply: $3\sqrt{64}=3\cdot 8$.
4. Compute: $3\cdot 8=24$.
5. Final answer: $24$.
Radical Evaluation Eaa688
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