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Wolf
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 Posted: Tue Dec 04, 2007 12:52 am Post subject: Bleh...Math |
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Snoink, I need you now!
*clutches chest and staggers around*
I'm not even going to say what percentage I got in Math this semester..but suffice to say that it was completely abysmal.
Anyways. Umm...I know I learnt Cross Multiplying in 4th grade or something, but I can't...seem to remember it...heh heh. So yeah. I majorly need to get help with Cross multiplication, else I fail the upcoming Math mini-exam.
  
Please? *is meek*
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Leja
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| Posted: Tue Dec 04, 2007 2:27 am Post subject: |
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I can help ^_^
Let's say you had 2/4=x/8. When you cross multiply in this example, you'd multiply the two and the eight and set it equal to the 4 multiplied by the x:
2*8=x*4
or
16=4x
where you'd then solve for x and come up with four. (see scribble below for a better representation)
Now you might have something different than x. Maybe you have 2x+2, in which case you'd do the same thing if the equation is 2/4=(2x+2)/8. You'd multiply the top of one by the bottom of the other and set it equal to the bottom of one by the top of the other:
2*8=4*(2x+2)
which simplifies to:
16=8x+8
8=8x
and finally
x=1
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Snoink
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Snoink
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| Posted: Tue Dec 04, 2007 5:49 am Post subject: |
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Because we love unit conversions!
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Leopluridon '08: He Will Show Us The Way! |
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Snoink
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Snoink
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Snoink
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Snoink
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| Posted: Tue Dec 04, 2007 5:56 am Post subject: |
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And then... the magic.
I find that colors can sometimes make things apparent to me, so hopefully it's that way for you too. Sometimes, black and white doesn't work. So I put green and blue in, to imply what gets multiplied. Hopefully, it makes sense...?
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Last edited by Snoink on Tue Dec 04, 2007 5:58 am; edited 1 time in total |
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Snoink
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| Posted: Tue Dec 04, 2007 5:57 am Post subject: |
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Solving it:
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TL G-Wooster
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| Posted: Tue Dec 04, 2007 11:11 am Post subject: |
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Oh golly, that looks so complicated! I never did anything like that... is it an American "thing"? *is very very hopeful*
Hope your grade goes well, Elfie!
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| Posted: Tue Dec 04, 2007 4:38 pm Post subject: |
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Well, I've never even heard of cross multiplication, nor have I ever seen anything like that. I'm guessing, like Twitters, that it's an American thing.
*Strides ignorantly confidently onwards*
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| Posted: Tue Dec 04, 2007 4:45 pm Post subject: |
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| I've done it before. Apparently you only need it in England if you take maths and further maths at A level and then you spend a lesson or two on it and start applying it to partial fractions and other fun areas of maths.
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| Posted: Wed Dec 05, 2007 12:39 am Post subject: |
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I'm an American and the two schools I went to NEVER taught that!
Confusing! =]
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Wolf
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| Posted: Wed Dec 05, 2007 1:09 am Post subject: |
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Wow, thanks you guys!
I really appreciate it! I'm pretty sure I know what I'm doing now. ^_^
And Snoink, you saved my life. I shudder to think what my parents would do if I failed another test...*shudders*
Anyways, muchos gracias (that how you spell it? Lol) for the time and brain power you put into helping me!
Thanks again,
Ayra 
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Gwenevire
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| Posted: Wed Dec 05, 2007 1:26 am Post subject: |
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Wow... I haven't learnt that yet. My school is for dummies. I feel stupid 
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