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Question

Find the cube root of 9261 through estimation.

A
21
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B
31
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C
28
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D
23
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Solution

The correct option is A 21Step 1: Start making groups of 3 digits starting from the unit place. i.e 9 261 Second group First group Step 2: First group i.e 261 will give us the units digit of the cube root. As 261 ends with 1. So, the units place of the cube root will be 1. Step 3: Now, take second group i.e. 9. We know that 23<9<33 As the smallest number is 2, it becomes the tens place of the required cube root ∴3√9261 = 21

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