Solution 34838: Calculating the Least Common Multiple (LCM) of Two Numbers on the TI-83 Plus and TI-84 Plus Family of Graphing Calculators.
How do I calculate the least common multiple (lcm) of two numbers on the TI-83 Plus and TI-84 Plus family of graphing calculators?
To calculate the least common multiple of two numbers, follow the example below.
Example: Find the least common multiple of 2 and 5.
• Press [MATH] then [Right Arrow] to select "NUM".
• Press  to select the 8: lcm( function.
• Press  [,]  [ ) ] [ENTER] to complete the input and finish the calculation.
Please see the TI-83 Plus and TI-84 Plus Family guidebooks for additional information.