find the one"s digit of the cube

1)3331

2)5022'

3)8888

(1)  3331

One's digit of the given number = 1

cube of one's digit = 1

so, unit's digit of the cube of the given number = 1

(2) 5022

One's digit of the given number = 2

cube of one's digit = 8

so, unit's digit of the cube of the given number = 8

(3) 8888

One's digit of the given number = 8

cube of one's digit = 512

so, unit's digit of the cube of the given number = 2