Square roots·√70
√70 =
√70
≈ 8.3666

Square root of 70 — 8.3666 (√70)

Irrational

The square root of 70 is about 8.3666, or exactly √70. It lies between 8 and 9.

As a decimal
≈ 8.3666
Simplified surd
√70 = √70
Between
8 < √70 < 9
Squared
70² = 4900
Cube root
∛70 ≈ 4.121285

Nearby numbers

√67 = √67√68 = 2√17√69 = √69√71 = √71√72 = 6√2√73 = √73

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 70?

About 8.3666, or exactly √70.

Q. Can the surd be simplified?

No — there is no square factor to pull out.

Q. Between which integers does it fall?

Between 8 and 9.

Q. What is the cube root of 70?

About 4.121285.