Author note — to cover

Cube roots of perfect cubes including negatives like the cube root of -27, and higher roots such as the fifth root of 32, as inverses of powers; calculator root keys. Fractional-index notation for roots is Higher, on unit-fractional-indices; estimation lives on Measures. Both tiers. (N6, N7)

Introduction

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Practice and continue

Practice

Cube roots and higher roots

Cube roots and nth roots as the inverse of a power, including negatives.

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Adding and subtracting negative numbers

Number-line reasoning, two signs meeting, and temperature differences.