Question

what digit will come in unit place of cube of number 128​

Answer 1

Given,

The main number is = 128

To find,

The unit digit of the cube of the main number.

Solution,

First of all, we have to calculate the cube of the given main number.

When we multiply the triplet of a same number, then the result of that multiplication is the cube of that number. Example- if "x" is a number, then (x×x×x) = x³, is the cube of the "x".

Cube of the main number = (128)³ = 128×128×128 = 16384 = 16384×128 = 2097152

Calculations :

128

×128

_____

1024

256×

128××

______

= 16384

16384

× 128

_____

131072

32768×

16384××

_______

= 2097152

Now, the unit digit of a number is the right most digit of that number.

The right most digit of the cube of the main number is 2. So, the unit digit of the cube of the given main number is also 2.

Hence, the 2 is the unit digit of the cube of the main number.

Answer 2

Given :   cube of number 128​

To find :  digit in unit place of cube of number 128​

Solution:

To find unit digit in cube of 128

we will find cube of unit digit of 128

cube of unit digit of a number will have same unit digit as cube of number

8³ = 8 x 8 x 8  = 512

Ends with 2

Hence cube of number 128​  ends with 2

digit in unit place of cube of number 128​ is 2

cube of number with unit digit 0  ends with a number with unit digit 0

cube of number with unit digit 1  ends with a number with unit digit 1

cube of number with unit digit 2  ends with a number with unit digit 8

cube of number with unit digit 3  ends with a number with unit digit 7

cube of number with unit digit 4  ends with a number with unit digit 4

cube of number with unit digit 5  ends with a number with unit digit 5

cube of number with unit digit 6  ends with a number with unit digit 6

cube of number with unit digit 7  ends with a number with unit digit 3

cube of number with unit digit 8  ends with a number with unit digit 2

cube of number with unit digit 9  ends with a number with unit digit 9

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