Hi! Im quite new at Maths in general, just recently started get an intrest for it (Aswell as general physics/philosophy) and im trying to learn on my own, so if this question is totally retarded, feel free to let your anger out haha.(adsbygoogle = window.adsbygoogle || []).push({});

Anyway, I borrowed a book from a friend that looked fun, "Mathemathics for Engineers".

And after 5 pages i ran into some trouble, with one of the explanations in the book.

So they show how we multiply fractions, this is the example used:

[itex]\frac{2}{3}[/itex] * [itex]\frac{5}{12}[/itex] = [itex]\frac{2*5}{3*12}[/itex]=[itex]\frac{1*5}{3*6}[/itex]=[itex]\frac{5}{18}[/itex]

So what im not really understanding is how we go from [itex]\frac{2*5}{3*12}[/itex] to [itex]\frac{1*5}{3*6}[/itex].

What it looks like is that they have divided 2 by 2 and 12 by 2. I understand why this is done, to shorten the number down, the results will still be same, 5/18 or 10/36. But why the 2 and 12? Just because they are the easiest ones to shorten? And if so, which are the rules for shortening numbers down?

Best regards,

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# Multiplying Fractions Clarification

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