Question

Find the cube roots of the following perfect cubes using estimation. a. 21952

Answer 1

First let us divide number in two parts that is 21 and 952

let us see the first pair

952

in last of 952 there is 2 and cube of 2 is 8 which qualifies for the ones place of the required cube root

let us see the second pair - 21

in last of 21 there is 1 and cube of 1 is one so

3√21952=18 answer

Answer 2

Answer:

here is your answer

Step-by-step explanation:

= Take last 3 digit. The last digit is 2 it means it's cube root will have 8 as it's unit digit. Now cut the last two digits and focus on remaining digits which are 21. Now think of a number whose cube is less than or equal to the number 21. That is 2 .So your answer is 28