Finding the Least Common Multiple
(LCM):
LCM is found under MATH → NUM, arrow down to #8: lcm(

From the home screen, choose
lcm( followed by
two numbers separated by a comma. 

NOTE:
lcm( accepts
nonnegative integers only and works with only two
entries at a time.

Example:
Find the LCM for 10, 15, and 45.

Since LCM can only accept two entries
at a time, find the LCM of the first two values, and
then find the LCM of your answer and the third value. 

Finding the
Greatest Common Factor (GCF):
NOTE:
The calculator refers to the GCF as the
GCD, greatest common divisor. 
GCD is found under MATH → NUM, arrow down to #9: gcd( 
From the home screen, choose
gcd( followed by
two numbers separated by a comma. 

NOTE:
gcd( accepts nonnegative integers only and works with
only two entries at a time.

Example:
Find the GCF (or GCD) for 12, 24, and 32.

Since GCD can only accept two entries
at a time, find the GCD of the first two values, and
then find the GCD of your answer and the third value. 

