What will be the unit digit of the squares of the following numbers?

(i) 81 (ii) 272


(iii) 799 (iv) 3853


(v) 1234 (vi) 26387


(vii) 52698 (viii) 99880


(ix) 12796 (x) 55555


(i) 81


Since, here the given number has its unit place digit as 1, its square will end with the unit digit of the multiplication of unit place digit of the number with the unit place digit of the number itself.


(1 x 1 = 1) i.e., 1


(ii) 272


Since, here the given number has its unit's place digit as 2, its square will end with the unit digit of the multiplication of unit place digit of the number with the unit place digit of the number itself.


(2 x 2 = 4) i.e., 4


(iii) 799


Since the given number has its unit's place digit as 9, its square will end with the unit digit of the multiplication (9 x 9 = 81) i.e., 1


(iv) 3853


Since, here the given number has its unit's place digit as 3, its square will end with the unit digit of the multiplication of unit place digit of the number with the unit place digit of the number itself.


(3 x 3 = 9) i.e., 9


(v) 1234


Since, here the given number has its unit's place digit as 4, its square will end with the unit digit of the multiplication of unit place digit of the number with the unit place digit of the number itself.


(4 x 4 = 16) i.e., 6


(vi) 26387


Since, here the given number has its unit's place digit as 7, its square will end with the unit digit of the multiplication of unit place digit of the number with the unit place digit of the number itself.


(7 x 7 = 49) i.e., 9


(vii) 52698


Since, here the given number has its unit's place digit as 8, its square will end with the unit digit of the multiplication of unit place digit of the number with the unit place digit of the number itself.


(8 x 8 = 64) i.e., 4


(viii) 99880


Since the given number has its unit's place digit as 0.


Hence, its square will have two zeroes at the end. Therefore, the unit digit of the square of the given number is 0


(xi) 12796


Since, here the given number has its unit's place digit as 6, its square will end with the unit digit of the multiplication of unit place digit of the number with the unit place digit of the number itself.


(6 x 6 = 36) i.e., 6


(x) 55555


Since, here the given number has its unit's place digit as 5, its square will end with the unit digit of the multiplication of unit place digit of the number with the unit place digit of the number itself.


(5 x 5 = 25) i.e., 5


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