Question

Find the cube root of 91125 by estimation method.​

Answer 1

Step 1: Form groups of three starting from the rightmost digit of 91125.

91 125.

Step 2: Take 125. The digit 5 is at its one's place. We take the one's place of the required cube root as 5.

Step 3: Take the other group, i.e., 91. Cube of 4 is 64, and cube of 5 is 125. 91 lies between 64 and 125.

Answer 2

Step-by-step explanation:We need to find the cube root of 91125

Now, lets make batch of 3, as 091 125

Lets take 125, now the number is ending in 5 so the unit digit of the number will be 5

now 091, we need to see which number cube will be nearest to 091

and we have the cube of 4 = 64

So, the number is 45.

(45)³ = 91125

∛91125 = 45

Our number is 45

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