Question
Making use of the cube root table, find the cube root 5112

Answer

By prime factorisation, we have:
$5112=2^3 \times 3^2 \times 71$
$\Rightarrow \sqrt[3]{5112}$
$=2 \times \sqrt[3]{9} \times \sqrt[3]{71}$
By the cube root table, we have:
$\sqrt[3]{9}=2.080 \text { and } \sqrt[3]{71}=4.141$
$\therefore \sqrt[3]{5112}$
$=2 \times \sqrt[3]{9} \times \sqrt[3]{71}$
$=2 \times 2.080 \times 4.141$
$=17.227 \text { (upto three decimal places) }$
Thus, the required cube root is 17.227 .

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