Question

cube root by estimatio​

Answer 1

Find the cube root of 238328.

Solution :

238328 is an even number so its cube root has to an even number.

Make two groups ---> 238 328 

First group 328 ---> unit digit is 8 so unit digit of cube root will be 2. 

(see the above table).

Second Group 238 -----> it lies between 63=216 and 73 =343 .

So take the smaller number 6 as ten's place.

∴ ∛238328 = 62