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

[dsriram2002]

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?

[factor-fiction]

Multiply them together

[factor-fiction]

Actually it's 5083.

[Flyhalf]

It is the product of the two, since they have no common factor other than 1.

[factor-fiction]

I took your question at face value initially but you were wrong about the HCF- it's 23

[Flyhalf]

Nice illustration here:
http://www.mathsisfun.com/least-common-multiple.html

[Flyhalf]

Were the two numbers 299 and 391?
If so, the hcf is 23, and the lcm 5083 (23 times 17 times 13)

[bibblebub]

it's all down to using their prime factors

[bibblebub]

as a formula: lcm = xy / hcf

[factor-fiction]

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

[dsriram2002]

I want to know HOW to do it?

[maggiebee]

PLEASE speak English - this is Double Dutch to me duh.

[Flyhalf]

Bibblebub's method works, and here is one for kids to use:
http://www.mathsisfun.com/least-common-multiple.html