You need at least two numbers to find either a GCF or an LCM.
The numbers 2 and 30 have a GCF of 2 and an LCM of 30.
3 and 30
You can find the GCF of two numbers by dividing their product by their LCM. The LCM of 30 and 42 is 210. What is their GCF? 30 x 42 = 1260 divided by 210 = 6 The GCF of 30 and 42 is 6.
10 and 6020 and 30
2 and 15
30 and 40
The GCF is 10. The LCM is 30.
They are: gcf = 15 and LCM = 30
lcm is 30, gcf is 5
To have either an LCM (Least Common Multiple) or GCF (Greatest Common Factor), you must have two or more numbers.
2 and 30 6 and 10
The LCM will never be less than the GCF of a set of numbers.