IV. Math Menu

    A. 1:Number     

 Press . Use and
to select the menu of choice.

Not all options are given in the entry format. Options that are used frequently will be included, but others are omitted from the table. For a complete format listing, you can check the TI-89 manual. Results in complex mode are not covered. They can be found in the manual.

Operation
Entry Format
Explanation
Screen
1:exact exact(expression1)
exact(list1)
exact(matrix1)
exact({exp1,exp2...})
Uses Exact Mode and
overrides the set mode.
2:abs abs(expression1)
abs(list1)
abs(matrix1)
abs({exp1,exp2...})

Returns the absolute
value of the argument.

If a variable has an assigned
value, that is the value used.

3:round round(expression1 [,digits]) Returns the argument rounded
to the specified number
of digits after the decimal point.
Digits is an integer 0-12.
Default is 12.
4:iPart ipart(expression1)
ipart(list1)
ipart(matrix1)
ipart({exp1,exp2...})
Returns the integer part
of the argument.
5:fPart fpart(expression1)
fpart(list1)
fpart(matrix1)
fpart({exp1,exp2...})
Returns the fractional part
of the argument.
6:floor floor(expression)
floor(list1)
floor(matrix)
floor({exp1,exp2...})
This is identical to the greatest
integer function. Returns the
greatest integer less than or
equal to the expression.
7:ceiling ceiling(expression)
ceiling(list1)
ceiling(matrix)
ceiling({exp1,exp2...})
Returns the nearest integer
that is greater than or equal
to the argument.
8:sign sign(expression)
sign(list1)
sign(matrix)
sign({exp1,exp2...})

Returns 1 if the expression is
positive. Returns -1 if it
is negative.

9:mod mod(expression1,expression2)
mod(list1,list2)
mod(matrix1,matrix)

Returns the first argument
modulo the second argument
as defined by:

A:remain remain(expression1,expression2)
remain (list1,list2)
remain(matrix1,matrix)
Returns the remainder of the
first argument modulo the second
argument as defined by:

B:lcm lcm(number1,number2)
lcm(list1,list2)
lcm(matrix1,matrix)
Returns the least common multiple
of the two arguments.
C:gcd gcd(number1,number2)
gcd(list1,list2)
gcd(matrix1,matrix)
Returns the greatest common
divisor of the two arguments.

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