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Answer :
As we know that unit's place is affected only by the unit’s place of the number of which square is seen. So we have:
(i) Unit digit of \(81^2\) = 1 [Unit’s place=1 i.e, \(1 \times 1\) =1]
(ii) Unit digit of \(272^2\) = 4 [Unit’s place=2 i.e, \(2 \times 2\) =4]
(iii) Unit digit of \(799^2\) = 1 [Unit’s place=1 i.e, \(9 \times 9\) =1]
(iv) Unit digit of \(3853^2\) = 9 [Unit’s place=3 i.e, \(3 \times 3\) =9]
(v) Unit digit of \(1234^2\) = 6 [Unit’s place=4 i.e, \(4 \times 4\) =6]
(vi) Unit digit of \(26387^2\) = 9 [Unit’s place=7 i.e, \(7 \times 7\) =9]
(vii) Unit digit of \(52698^2 \)= 4 [Unit’s place=8 i.e, \(8 \times 8\) =4]
(viii) Unit digit of \(99880^2\) = 0 [Unit’s place=0 i.e, \(0 \times 0\) =0]
(ix) Unit digit of \(12796^2\) = 6 [Unit’s place=6 i.e, \(6 \times 6\) =6]
(x) Unit digit of \(55555^2\) = 5 [Unit’s place=5 i.e, \(5 \times 5\) =5]