# The TI-83 Plus Math NUM Submenu

The Math NUM submenu on the TI-83 Plus graphing calculator offers several functions —**abs**, **round**, **iPart** and **fPart**, **int, min** and **max**, and** lcm** and **gcd**. To access the Math NUM submenu, press

## How to find the absolute value on TI-83 Plus

The **abs** function evaluates the absolute value of the number or arithmetic expression that follows the function. This number or expression must be enclosed in parentheses. The calculator supplies the first parenthesis; you must supply the last parenthesis.

## How to round numbers on TI-83 Plus

The **round** function rounds a number or arithmetic expression to a specified number of decimal places. The number or expression to be rounded and the specified number of decimal places are placed after the function separated by a comma and surrounded by parentheses. The calculator supplies the opening parenthesis; you must supply the closing parenthesis.

## How to find the integer and fractional parts of a value

The **iPart** and **fPart** functions (respectively) find the integer and fractional parts of the number, or the arithmetic expression that follows the function. This number or expression must be enclosed in parentheses. The calculator supplies the opening parenthesis; you must supply the closing parenthesis.

## How to use the greatest-integer function on TI-83 Plus

The **int** function finds the largest integer that is less than or equal to the number or arithmetic expression that follows the function. This number or expression must be enclosed in parentheses. The calculator supplies the opening parenthesis; you must supply the closing parenthesis.

## How to find minimum and maximum values in a list of numbers

The **min** and **max** functions find (respectively) the minimum and maximum values in the list of numbers that follows the function. Braces must surround the list, and commas must separate the elements in the list. You can access the braces on the calculator by pressing **[2nd][ ( ]** and **[2nd][ ****)**** ]**. The list must be enclosed in parentheses. The calculator supplies the opening parenthesis; you must supply the closing parenthesis.

When using the **min **or **max** function to find the minimum or maximum of a two-element list, you can omit the braces that surround the list. For example, **min**(2, 4) returns the value 2.

## How to find least common multiple and greatest common divisor

The **lcm** and **gcd** functions find (respectively) the least common multiple and the greatest common divisor of the two numbers that follow the function. These two numbers must be separated by a comma and surrounded by parentheses. The calculator supplies the opening parenthesis; you must supply the closing parenthesis.