Question

6. Find the smallest number that must be added to 400 to make it a perfect cube. Also, find
the cube root of this perfect cube.
​

Answer 1

nearest cube number to 400

is 512 =8^3

therefore,

number that should be added to 400 is 512-400= 112

Answer 2

7³<400<8³ So, the cube of 8 is greater than 400 Then we subtract from the cube of 8 to 400 the result is 112 then we have to add 112 to 400 then the answer 512 that is the cube of 8 .