Square Root of 81
Calculate √81 instantly — exact value, step-by-step explanation, and properties.
How to Calculate √81
The square root of 81 is exactly 9. This is because 9 × 9 = 81. Since 81 is a perfect square, its square root is a whole number. You can verify: 9² = 9 × 9 = 81.
√81 = 9 (because 9 × 9 = 81) Properties of √81
Perfect Square?
Yes
81 = 9², so its square root is a whole number.
Decimal Value
9
Exact integer result.
Square Root Symbol
√81
Also written as 81^(1/2) or 81^0.5 in programming.
Related Square Root Values
Reference table of square roots near 81 for quick comparison.
Frequently Asked Questions
What is the square root of 81?
The square root of 81 is exactly 9. Since 81 is a perfect square, √81 = 9.
Is 81 a perfect square?
Yes, 81 is a perfect square. It equals 9², meaning 9 × 9 = 81.
How do you calculate √81 by hand?
Since 81 is a perfect square, you can find √81 by identifying which integer multiplied by itself equals 81. The answer is 9, because 9 × 9 = 81.
What is √81 in simplified radical form?
√81 = 9. Since it's a perfect square, no radical form is needed.