ROUND (SSIS Expression)
Applies to: 
SQL Server
SSIS Integration Runtime in Azure Data Factory
Returns a numeric expression that is rounded to the specified length or precision. The length parameter must evaluate to an integer.
Syntax
ROUND(numeric_expression,length)
Arguments
numeric_expression
Is an expression of a valid numeric type. For more information, see Integration Services Data Types.
length
Is an integer expression. It is the precision to which numeric_expression is rounded.
Result Types
The same type as numeric_expression.
Remarks
The length argument must evaluate to a positive integer or zero.
ROUND returns a null result if the argument is null.
Expression Examples
These examples round numeric literals to a length of three. The first return result is 137.1570, the second 137.1580.
ROUND(137.1574,3)
ROUND(137.1575,3)