Given number: 1023
1023=323=10.66 66 66.....
In order to find the square root correct to two places of decimal, we have to find the square root up to three places. Therefore, we have to convert 1023 as a decimal correct to six places.
Now, lets evaluate the √10.66666......
Which we rounded to √10.666667
From the table,√10.666667=3.265(approximately)
⇒√1023=3.27 (correct to two places of decimal)