Huh?

[Greg Ward]

1/4 X 8/5 = 18/45

Doesn't it?


Greg

[BobR]

Nope!

[benupton]

I don't get it can you do that?

[danielhobby]

nope its 4/10ths i think

[Calm]

1/4 X 8/5 = 18/45

Doesn't it?


Greg

.25 x 1.6 = .4 = 2/5

Cheers

[snapman007]

1/4 X 8/5 = 18/45

Doesn't it?


Greg

(1x8) / (4X5) = 8/20 (2/5) or 0.4 as Calm said.:)

[HazzaB]

Hey There,

My calcs come out the same as Calm but where did you get 18/45 from???:no:
1/4 x 8/5 = 8/20 =2/5
once I wrote it down I see where the 18/45 came from the little x means multiply:rolleyes:

HazzaB

[benupton]

This was kind of what i was thinking.

[Scott]

In order to deal with fractions you always have to find the common denominator. For this calculation I've used 20. IE:

1/4 = 5/20 and 8/5 = 32/20.

5/20 x 32/20 = 160/400.

Break 160/400 down and it equals 2/5.

2 div 5 = 0.4.

1 inch = 25.4mm

Multiply 0.4 x 25.4 = 10.16mm.

Hope I haven't confuddled anyone! :;

[Greg Ward]

But 1/4 X 8/4
is not the same as 18/44

or
1/4 X 8/3
is not the same as 18/43


Whereas 1/4 X 8/5 = 18/45 = 0.4

Why?

[HazzaB]

But 1/4 X 8/4
is not the same as 18/44

or
1/4 X 8/3
is not the same as 18/43


Whereas 1/4 X 8/5 = 18/45 = 0.5

Why?


Hey Where did you learn numbers from, that don't work either :no:

18/45 = 18 divided by 45 which = 0.4

[Greg Ward]

Corrected. Thanks.
Should have been 0.4

But don't criticize my maths.
I'll give you another example:

1/2 X 5/4

or

1 x 5
-----------
2 x 4

= 15/24 = 5/8

try it for

1 x 5
--------
2 x 6

..... This does not equal 15/26

Greg

[Claw Hama]

:UGreg have you been cutting too much Camphor again?

[HazzaB]

Hey Greg,

1 x 5 = 5
--------- ---
2 x 4 = 8 the 15/24 is just lucky (This happens now and again)

the next one is

1 x 5 = 5
--------- ---
2 x 6 = 12 equals 10/24 if you want to be silly

HazzaB

[Greg Ward]

1/2 x 5/6 doesn't equal 15/26..... sorry


There are only 14 'solutions'
1,2,5,4
(1/2 x 5/4 = 15/24) etc.
1 4 8 5
1 6 4 3
1 6 6 4
1 9 9 5
2 1 4 5
2 6 6 5
4 1 5 8
4 9 9 8
6 1 3 4
6 1 4 6
6 2 5 6
9 1 5 9
9 4 8 9

and others where the numerator and denominator are the same number.

I'm not what sure this all means,,,,,,,,

Time for a beer I think

Regards

Greg

[Wongo]

Don't worry Greg. I understand why you are confused. It is because you know your maths and this stupid piece of algebra took you to space and back for no reason.

So how can you have 45 as the common denominator for 4 and 5? It doesn't make sense does it. It can be 20, 40 or 60 but not 45. Correct! you cannot have 45 as the common denominator for 4 and 5.

1 on 4 times 8 on 5 is 8 on 20. 8 on 20 can be simplified to 2 over 5. Got it?

Now some silly bugger for some unknown reason happened to multiple 2 over 5 by 9. That gave you 18 on 45. Confusing isn't it? It is no worse than 6 / 15 I guess.


:D

[Greg Ward]

I'm well aware of what I have typed. I don't have confusion at all unless it's with women.
What this is all about is that there is a small number (14) of groups of numbers where the multiplication of the numerator and denominators of two fractions provide a number equal to that of the same numbers when just placed together on the numerator and denominator.
It's good fun.

good night....
See you next weekend.
Greg

[artme]

You don't need common denominators to multiply or divide fractions, as someone said.

You do need them to add or subtract frations.