Cube Root of 1125

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What is the cube root of 1,125?

Answer

∛1,125 =
5∛9 ≈ 10.4004

Real cube root: the only number whose cube is 1,125.

≈ — rounded to 4 decimal places. 1,125 is not the cube of a rational number, so ∛1,125 is irrational: its decimal expansion never ends and never repeats.

Prime factors
1,125 = 3 × 3 × (5 × 5 × 5) = 3² × 5³
Take out of the root
∛1,125 = ∛(5³ × 9) = 5∛9
Between cubes
10³ = 1,000 < 1,125 < 1,331 = 11³, so 10 < ∛1,125 < 11 and ∛1,125 ≈ 10.4004

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FAQ

What is the cube root of 1,125?

∛1,125 = 5∛9 ≈ 10.4004

How to simplify ∛1,125?

Factor 1,125 into primes: 1,125 = 3 × 3 × 5 × 5 × 5. Each triple of equal factors is a cube and comes out of the root as one factor; the rest stays under it: ∛1,125 = ∛(5³ × 9) = 5∛9.

Is ∛1,125 a rational number?

No: 1,125 is not the cube of a rational number, and the cube root of a fraction p/q in lowest terms is rational only when p and q are both cubes. So ∛1,125 is irrational; its decimal never ends and never repeats: ∛1,125 ≈ 10.4004.