Q. 164.7( 3 Votes )

Find the tens dig

Answer :

(i) 226981


Let’s take number 226981.


Unit digit = 1


So unit digit in the cube root of 226981 = 1


After striking out the units, tens and hundreds digits of 226981,


Now we left with 226 only.


As we know that 6 is the Largest number whose cube root is less than or equals to 226(63<226<73).


So,


The tens digit of the cube root of 226981 is 6.


(ii) 13824


Let’s take number 13824.


Unit digit = 4


So unit digit in the cube root of 13824 = 4


After striking out the units, tens and hundreds digits of 13824,


Now we left with 13 only.


As we know that 2 is the Largest number whose cube root is less than or equals to 13(23<13<33).


So,


The tens digit of the cube root of 13824 is 2.


(iii) 571787


Let’s take number 571787.


Unit digit = 7


So unit digit in the cube root of 571787 = 3


After striking out the units, tens and hundreds digits of 571787,


Now we left with 571 only.


As we know that 8 is the Largest number whose cube root is less than or equals to 571(83<571<93).


So,


The tens digit of the cube root of 571787 is 8.


(iv) 175616


Let’s take number 175616.


Unit digit = 6


So unit digit in the cube root of 175616 = 6


After striking out the units, tens and hundreds digits of 175616,


Now we left with 175 only.


As we know that 5 is the Largest number whose cube root is less than or equals to 175(53<175<63).


So,


The tens digit of the cube root of 175616 is 5.


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