Solution 34838: Calculating the Least Common Multiple (LCM) of Two Numbers Using the TI-84 Plus C Silver Edition Graphing Calculator.
How do I calculate the least common multiple (lcm) of two numbers using my TI-84 Plus C Silver Edition graphing calculator?
To calculate the least common multiple of two numbers using the TI-84 Plus C Silver Edition, follow the example below.
Example: Find the least common multiple of 2 and 5.
• Press [MATH] and arrow to the right to select "NUM".
• Press  to select the lcm( function.
• Press  [,]  [ ) ] [ENTER] to complete the input and finish the calculation.
Please see the TI-84 Plus C Silver Edition guidebook for additional information