It's easy to guess. The nearest square number below 43 is 36 = 62, and the nearest above is 49 = 72. The square root of 43 must be between 6 and 7 then.
6.6
6.557
43
It is 43.
43.4 rounded to the nearest whole number is 43
43.1 rounded to the nearest whole number is 43
43
The answer is 43
It is: 43
43
43