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#1
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01-17-2004, 04:41 PM
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I don't get math!
In my class,we are having to do equivalent fractions.I don't get all this cross-multiplication nonsense.Will someone help me!
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#2
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01-17-2004, 05:11 PM
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Re: I don't get math!
Give us some examples of problems and we will help you out.
What you said makes me think of a couple of different setups.
__________________
 I've officially retired from ZU, guys. I left loving this place, and I enjoyed the company of so many of you. Thank you for sharing with me, and I hope that in some way I've touched your lives (hopefully for the better and to God's glory). In Jesus' name, I end this chapter and open another! -BBD+ (and just for old times' sake...) :0( :0o :0S :0P'' ;0) ()_(); *_* >_> <_< o_O :0| :0\ :0O :09 and finally :0) |
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#3
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01-17-2004, 05:20 PM
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Re: I don't get math!
Fractions are division problems. Or, more correctly, division problems are fractions.
equivalent fractions can be explained like this: both 4 divided by 2 and 2 divided by 1 equal 2. Thus, 4/2 (which can be said as 4 over 2 or 4 divided by 2) is the same as (equal to) 2/1. This also works for fractions that are less than 1, such as 1/2 and 3/6. The idea of cross-multiplication is derived from the idea that any operation preformed on both sides of an equal sign do not change the values. I belive that is explained extensively in Algebra I. Here is an example for cross multiplication: You have two fractions, 2/5 and 6/15 they are said to be equal. If you multiply the denominator (the bottom number) of the first fraction by the numerator (the top number) of the second fraction, you get 30 (5x6=30). If you multiply the numerator of the first fraction by the denominator of the second fraction, you also get 30 (2x15=30). Thus, it is true that they are equal. And here's another example of the uses of cross-multiplication: You are asked to find a number, we'll call this number n. You are given the equation 2/n=3/6. The first thing you will want to do is what I explained in the first problem, which is take the denominator of the first fraction and multiply it by the numerator of the second fraction, and multiply the 1st numerator and 2nd denominator. This gives you 3n and 12. As said before, these numbers will be equal, since the fractions are equal. Thus, 3n=12. By dividing both sides of the equation by 3, you end up with n=4 (12/3=4). Edit: heh, bbd. I thought I'd just make up some problems to explain...
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#4
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01-19-2004, 08:21 PM
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Re: I don't get math!
Thanks! I think I get it!
Example 2/4=1/2 4x1=4 2x2=4 I'm so smart! p.s.:Wanna be on my buddy list?
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#5
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01-20-2004, 01:27 AM
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Re: I don't get math!
and the / equals a divide sign. So that means that...
2 divided by 4 = 0.5 and also 1 divided by 2 = 0.5 That's another way to find out they are the same
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