You can only round a number to 2 decimal places if it currently has more than 2 decimal places.
In Excel, the second argument of the Round function specifies the number of decimal places to round to. If this number is negative, it rounds to corresponding digits before the decimal point.
The number 3566.15 is already rounded to two decimal places.
The number 400.55 is already rounded to two decimal places.
It means to round a decimal number to its nearest hundredth place as for example 2.125 rounded to 2 decimal places is 2.13
2 decimal places is the second number after the decimal point. So in 13.256 the 5 is the second decimal place. To round, you look at the number to the right of the decimal place you want to round to. So in 13.256 we look at the 6. If a number is greater than or equal to 5 you round up, if the number is less than 5 you round down. So 13.256 rounded to 2 decimal places is 13.26%
To round 2 decimal places for square roots all that needed is the knowledge to round just any number.
rounded to two decimal places after the decimal point: 6.73
A number cannot be rounded to more decimal places than it started with.