Square roots·√129
√129 =
√129
≈ 11.357817

Square root of 129 — 11.357817 (√129)

Irrational

The square root of 129 is about 11.357817, or exactly √129. It lies between 11 and 12.

As a decimal
≈ 11.357817
Simplified surd
√129 = √129
Between
11 < √129 < 12
Squared
129² = 16641
Cube root
∛129 ≈ 5.052774

Nearby numbers

√126 = 3√14√127 = √127√128 = 8√2√130 = √130√131 = √131√132 = 2√33

From 1 to 200

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How to read this

  • The decimal is rounded; the surd form is the exact value.
  • Pulling out a square factor simplifies the surd — √50 = 5√2.
  • If the number is not a perfect square, the decimal never ends (irrational).
  • Knowing which two integers it sits between is enough to estimate in your head.

Frequently asked questions

Q. What is the square root of 129?

About 11.357817, or exactly √129.

Q. Can the surd be simplified?

No — there is no square factor to pull out.

Q. Between which integers does it fall?

Between 11 and 12.

Q. What is the cube root of 129?

About 5.052774.