Question

what is the cube root of 1305 by ones and tens method​

Answer 1

Answer:

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Answer 2

Answer:

Important points :

If a number ends with digit 0,1,4,5,6 and 9 .Then ,their cube also ends with digit 0,1,4,5,6 and 9 respectively .

Whereas, if a number ends with digit 2 or 3 .then, their cube ends with 8 and 7 respectively.

You can see in the given table :

⇒ The red box and yellow box indicates the above two conditions respectively

Cube of number from 1 to 20

Let’s talk about step by step procedure to calculate cube root using the ones and tens method

Step:01 Find the one’s digit of the required cube root.

Step:02 Cross out the last three-digit of the number

Step:03 Think of the number whose cube root is less than or equal to the remaining digit of the number (Digit left after Step:02)

Let’s take a number and try to find its cube root using the ones and tens method . Assumed number: 91125

Solution:

Step:01 Find the unit digit of the required cube root

Since we know 91125 is a perfect cube and its unit digit is 5 . So, its cube root unit digit will also 5.

See above table

Step:02 Cross out the last three-digit of the number