First you write down the numbers you are given and put them on an upside-down long division symbol. Divide the two together until you get to where you cannot divide any longer. Take the right side and bottom numbers and multiply them. This should be your LCM. If you cannot divide them at the first division, use the Listing Method, which is listing some of the multiples of that number and see which one is the smallest same number.
Hope this helped.
The GCF of 10 and 15 is 5.
The GCF is 1.
22 11,2 There are no elevens in 60, so the GCF has to be 2.
a and b have no common prime factors. Their LCM is their product.
The greatest common factor (GCF) refers to a factor that is COMMON to two or more numbers. You have only one number in the question! The greatest factor of any number is itself. So you do not need to use the division ladder or any other method!
The GCF of 10 and 15 is 5.
The GCF is 1.
The GCF is 3.
No matter what you use, you still need at least two numbers to find a GCF.
The GCF of 27 and 30 is 3.
2 |10,18 , |_________ 5,9 The GCF is 2.
when you need to get it down to a prime number
you have to use a factor tree
155,3105,2The GCF is 5.The GCF of 10 and 15 is 5.
22 11,2 There are no elevens in 60, so the GCF has to be 2.
The LCM of 6, 7 and 14 is 42. The easiest way to find this is through prime factorization. One way to notate the process of finding a prime factorization is through the use of division ladders, which are hard to draw on this website. Once you find the prime factorizations of 6 (2 x 3), 7 (7), and 14 (2 x 7), you combine the factors, eliminating duplicates. 2 x 3 = 6 7 2 x 7 = 14 2 x 3 x 7 = 42, the LCM
You can, but there are more efficient ways to find the LCM.