Question

class 8 maths chapter 7 exercise 7.2 Qno.3​

Answer 1

Answer:

cube root of 1331 without any calculation is 11

4913 = 17

12167 = 23

32768 = 32

Step-by-step explanation:

how i did it -

method - estimation

Finding cube root by estimation

Make group of 3 digit, starting from right.

The unit digit of cube root will be. Unit digit of cube root of 857375 = Unit digit of cube root of 375. Since 375 ends in 5, it's cube root will end in 5. (As 5 3 = 12 5 , 1 5 3 = 337 5 )

Now, for second group. 8 5 7. We note that. 9 3 = 729.

_hope it helps you_ :)