What is the Square Root of 81?

Instant answer with step-by-step solution

√81 = 9
√81 = 9
✓ 81 is a perfect square

Step-by-step explanation

  1. We need to find √81 — a number that when multiplied by itself equals 81.
  2. Check: is 81 a perfect square? Yes — because 9 × 9 = 81.
  3. Therefore √81 = 9
  4. Verification: 9² = 9 × 9 = 81 ✓
  5. 81 is a perfect square. Its square root is a whole number.

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Related calculations

Square root of 8181 square root√80 = 8.94427191√82 = 9.0553851381√79 = 8.8881944173√83 = 9.1104335791√84 = 9.1651513899√78 = 8.8317608663

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Also see

Square Root Laws Square Root Chart Easiest Method Negative Square Roots