Cube Roots Flashcards

GCSE Mathematics (Edexcel) 1MA1

Cube root definition

The cube root of a number is a value that, when multiplied by itself three times, gives the original number.

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Terms in this set (10)

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Cube root definition

The cube root of a number is a value that, when multiplied by itself three times, gives the original number.

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Symbol for cube root

The cube root is represented by the symbol ∛.

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Cube root of 8

The cube root of 8 is 2, because 2 × 2 × 2 = 8.

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Cube root of 27

The cube root of 27 is 3, because 3 × 3 × 3 = 27.

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Cube root of 1

The cube root of 1 is 1, because 1 × 1 × 1 = 1.

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Cube root of 0

The cube root of 0 is 0, because 0 × 0 × 0 = 0.

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Negative cube roots

The cube root of a negative number is negative. For example, ∛(-8) = -2.

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Cube root of 64

The cube root of 64 is 4, because 4 × 4 × 4 = 64.

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Cube root of 125

The cube root of 125 is 5, because 5 × 5 × 5 = 125.

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Estimating cube roots

To estimate a cube root, find the two perfect cubes it lies between. For example, ∛50 is between ∛27 (3) and ∛64 (4).

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