Step-by-step explanation:

(a) 1232 = 4

(b) 48496 = 6

(c) 3243 = 9

(d) 14324 = 6

Answer:

the unit digit of square of any number is simply the square of last digit of number

the unit digit of square of 1232 is 4 because square of last digit 2 is 4

the unit digit of square of 48496 is 6 because square of last digit 6 is 36

the unit digit of square of 3243 is 9 because square of last digit 3 is 9

the unit digit of square of 14324 is 6 because square of last digit 4 is 16