Texas Instruments TI-84 PLUS - Graphing Calculator Manual Book page 54

round(
returns a number, expression, list, or matrix rounded to (9). If is omitted,
round( #decimals #decimals
is rounded to the digits that are displayed, up to 10 digits.
value
round(value[,#decimals])
iPart(, fPart(
(integer part) returns the integer part or parts of real or complex numbers, expressions, lists,
iPart(
and matrices.
iPart(value)
(fractional part) returns the fractional part or parts of real or complex numbers, expressions,
fPart(
lists, and matrices.
fPart(value)
Note: The way the fractional result is displayed depends on the Answers mode setting. To convert from one
t ^
4 3 4
format to another, use F D on the FRAC shortcut menu ( 4).
int(
(greatest integer) returns the largest integer  real or complex numbers, expressions, lists, and
int(
matrices.
int(value)
Chapter 2: Math, Angle, and Test Operations 47