(i) By placing bars, we get

64 = 6̅4̅

Since there is only one bar, the square root of 64 will have only one digit in it

(ii) By placing bars, we get

144 = 1̅ 4̅4̅

Since there are two bars, the square root of 144 will have 2 digits in it

(iii) By placing bars, we get

4489 = 4̅4̅ 8̅9̅

Since there are two bars, the square root of 4489 will have 2 digits in it

(iv) By placing bars, we get

27225 = 2̅ 7̅2̅ 2̅5̅

Since there are three bars, the square root of 27225 will have three digits in it

(v) By placing the bars, we get

390625 = 3̅9̅ 0̅6̅ 2̅5̅

Since there are three bars, the square root of 390625 will have 3 digits in it