Square root of 90

√90 ≈ 9.4868

√90 is an irrational number, so its decimals never end or repeat. It sits between 9 and 10 because 9² = 81 and 10² = 100.

√90 rounded

Simplest radical form

90 = 9 × 10 and √9 = 3, so √90 = 3√10.

Check the answer

9.4868 × 9.4868 ≈ 89.9994, which is very close to 90.

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Square roots near 90

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