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Maths Help Needed

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grasscarp | 22:10 Mon 13th Sep 2010 | Quizzes & Puzzles
14 Answers
I was trying to help a child with maths homework this evening but could not manage this one.
There are two numbers
If 3 is the highest common factor, and 45 is the lowest common denominator what are the two numbers?
any help much appreciated.
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I hope that neither of you two were in my maths classes when I was teaching ;-)

9 & 15

Chris
22:19 Mon 13th Sep 2010
I cannot work that one out at all...though it is a long time since I was at school.....the factor/denominator are the wrong way round, are they ?
Question Author
No, that is how they were in the question. I havent got the sheet in front of me, and will see they young lad again tomorrow. It has to be handed in next Friday!
Sorry, meant is it possible that 3 is the lowest common denominator and 45 is the highest common factor ?
If so, would the numbers be 45 and 135 ?
I hope that neither of you two were in my maths classes when I was teaching ;-)

9 & 15

Chris
Question Author
Chris. you are a hero. I will pretend tomorrow that I worked it out!!!! Many thanks.
How do you work it out then , buenchico ?
Buenchico. I was just working it out-honest! It was taking me a while-60+ years since I did higher maths.
Question Author
I hope for our sake that Buenchico will look back in here, since we were not lucky enough to be in his class. I dont think I was ever in his class - with a face like that I would have remembered.
45 factorises as (1 x) 3 x 3 x 5

Both of the numbers we seek must divide into it so the only possible numbers to be considered are 1, 3, 9 (=3 x 3), 15 (=3x5) and 45.

But 3 must divide into both of the numbers we're seeking, so we can immediately exclude 1 from the possible pairings. That doesn't leave a lot to try!
I'll stick to crosswords from now on......

(Thanks, Buenchico)
Question Author
Many thanks teacher. (Buenchico)
Thanks for explanation, Buenchico
There ia another answer the two numbers could be 45 & 3.
Question Author
Thanks for your input Fibonacci. what were you doing getting up so early?

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