Apple iWork '09 - Manual (Page 205)

Chapter 8 Numeric Functions 205
Usage Notes
If  digits is omitted, it is assumed to be 0.
Examples
=TRUNC(1.49, 0) returns 1.
=TRUNC(1.50, 0) returns 1.
=TRUNC(1.23456, 3) returns 1.234.
=TRUNC(1111.222, -2) returns 1100.
=TRUNC(-2.2, 0) returns -2.
=TRUNC(-2.8, 0) returns -2.
Related Topics
For related functions and additional information, see:
“CEILING” on page 170
“EVEN” on page 173
“FLOOR” on page 176
“INT” on page 178
“MROUND” on page 183
“ODD” on page 185
“ROUND” on page 191
“ROUNDDOWN” on page 192
“ROUNDUP” on page 193
“More on Rounding” on page 355
“Listing of Numeric Functions” on page 167
“Value Types” on page 36
“The Elements of Formulas” on page 15
“Using the Keyboard and Mouse to Create and Edit Formulas” on page 26
“Pasting from Examples in Help” on page 41