Please Note: This article is written for users of the following Microsoft Excel versions: 2007, 2010, 2013, 2016, 2019, and Excel in Office 365. If you are using an earlier version (Excel 2003 or earlier), this tip may not work for you. For a version of this tip written specifically for earlier versions of Excel, click here: Determining the Least Common Multiple.
Remember your junior-high math classes? The teacher would write three or four numbers on the chalkboard and ask you to determine what larger number each of the numbers on the board could be a factor of. For instance, if the numbers were 2, 3,and 4, then they are all factors of the number 12. Thus, 12 is the least common multiple of those three numbers.
Things got really difficult when the teacher threw up six, seven, or ten numbers. Yikes! Fortunately, Excel makes calculating the least common multiple rather easy. All you need to do is put the numbers in a range of cells, and then use a formula like this:
=LCM(C20:C23)
In just a jiffy Excel returns a value that, sure enough, would have made that math teacher proud.
Just one gotcha here: If you use non-integer values with the LCM function, everything past the decimal point is ignored. In other words, the values are truncated before LCM does its magic. So, the bottom line is to make sure you are working with actual integers with LCM.
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2020-03-26 10:26:32
Peter Atherton
Hmm, It is a pity that there is now editing function here. Someone else has also made this comment ealier.
The first Pic is
(see Figure 1 below)
Figure 1.
2020-03-26 10:21:09
Peter Atherton
For something to do while stuck in the house I thought I'd try remembering how the HCF and HCD (GCD) worked.
The HFC is got by muliplying all the values and dividing the answer by the smallest value. A couple of functions are available, the PRODUCT and MIN functions. I also put these functions into a UDF as follows:
Function myLCM(ByVal ref)
Dim myMin As Long, myProd As Long
myProd = Evaluate("product(" & ref.Address & ")")
myMin = Evaluate("Min(" & ref.Address & ")")
myLCM = myProd / myMin
End Function
(see Figure 1 below)
The HCD (GCD) requires two loops, not shown in pic2. an outer loop For i = 1 to ref.count and an inner loop, Do ....Until a = 0. Here it is:
Function myHCD(ByVal ref)
Dim i As Long
Dim a, b, c
For i = 1 To ref.Count - 1
If IsEmpty(ref(i)) Then
i = i + 1
End If
If ref(i) > ref(i + 1) Then
a = ref(i): b = ref(i + 1)
Else: a = ref(i + 1): b = ref(i)
End If
Do
c = a Mod b
a = b
b = c
Loop Until b = 0
Next i
myHCD = a
End Function
(see Figure 2 below)
Figure 1. HCF Formula & UDF
Figure 2. HCD (GCD)
2020-03-24 11:19:13
Peter Atherton
John,
The HCF is called GCD (Greatest Common Denominator). Separated by a common language?
2020-03-23 17:06:30
John Mann
I Just noticed this tip. It took me back a very long way to my school days (I'm now 78), I don't remember the procedure any more, but I do remember that was one of the topics.
Along with LCM calculations, we were also taught the procedure for HCF calculations (Highest Common Multiple). So I immediately went and looked for that function in Excel 2010 - no joy.
As a matter of interest, got the same result for Open Office 4.14 - the LCM function worked, but no HCF function. I also tried the last version of Lotus 1-2-3. Neither function appeared to exist, but I couldn't check the help files since they won't run in Windows 10
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Please Note:
This article is written for users of the following Microsoft Excel versions: 2007, 2010, 2013, 2016, 2019, and Excel in Office 365. If you are using an earlier version (Excel 2003 or earlier), this tip may not work for you. For a version of this tip written specifically for earlier versions of Excel, click here: 
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