When computing an expression, numeric results that are not exact are rounded, not truncated.
For more information on rounding rules and how the RoundHalfwayMagUp and RoundNumberAsDec fields in DBSControl affect rounding, see “Numeric Data Types” in Teradata Vantage™ - Data Types and Literals, B035-1143 and “DBS Control utility” in Teradata Vantage™ - Database Utilities, B035-1102.