Square and cube roots

Indices

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Understand that there is a positive and negative square root but that this does not apply to a cube root. Recall up to the square root of 225 square root, including approximating square roots and recall up to the cube root of 125, including approximating cube roots. Understand it is invalid to square root a negative and know the positive root sign. Recognise the symbols and the words for square and cube root
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