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How Do You Find The Lcm Of Two Numbers By Knowing Their The Hcf?

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dsriram2002 | 16:49 Thu 03rd Jan 2013 | Jobs & Education
12 Answers
If I know the two numbers, and I even know the HCF of the two numbers, how can I find the LCM of the two numbers by using the HCF?
Eg: 299,391
Their HCF is 1, what is their LCM?
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as a formula: lcm = xy / hcf
17:16 Thu 03rd Jan 2013
Multiply them together
Actually it's 5083.
It is the product of the two, since they have no common factor other than 1.
I took your question at face value initially but you were wrong about the HCF- it's 23
Were the two numbers 299 and 391?
If so, the hcf is 23, and the lcm 5083 (23 times 17 times 13)
it's all down to using their prime factors
as a formula: lcm = xy / hcf
Hi dsiram- please can you change your 'best answer' as I'm conscious that the one you have picked of mine was wrong as I hadn't checked your statement that the HCF was 1
Question Author
I want to know HOW to do it?
PLEASE speak English - this is Double Dutch to me duh.
Bibblebub's method works, and here is one for kids to use:
http://www.mathsisfun.com/least-common-multiple.html

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