1.

Find the cube root of 19683?1. 472. 273. 574. 315. 17

Answer» Correct Answer - Option 2 : 27

Given:

The given number = 19683

Concept:

Calculation skills trick

Calculation:

Step(1):

First, we will take the digit at the unit’s place.

At the unit place, we have 3.

Step(2):

Now consider the cube table, the cube of which number has 3 at the unit digit place.

We see, 7 x 7 x 7 = 343.

Step(3):

That means the cube root of 19683 will have 7 at the unit place.

Step(4):

Now ignore the last 3 digits of 19683, i.e. 683

Step(5):

Taking 19 as a reference number, we can see from the cubes table 19 lies between cubes of 2 and 3.

Step(6): Here, we choose the lower number i.e. 2

∴ We get the two digit of the answer

∴ Cube root of 19683 = 27


Discussion

No Comment Found

Related InterviewSolutions