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 February 28 2013, 08:41 PM #1 Kenbushway Commander     Location: Georgia Math question I am trying to get better at math, the highest math I have is Algebra. For some reason I just can't do math. I have this homework helpers book about basic math and pre-algebra to help me understand math. Its talking about negative integers and distributive property. I was following along just fine until I got to this example it asked me to work out. 25x96 Now I thought I had this, so I went about to do this: (25x90) + (25x6) to get my answer but then I read how the book does it and I am completely lost. This is how the book did it: 25x96 = 25 x (100-4) = 25x100 + 25 x (-4) = 2,500 - 100 = 2,400 Where did they get this 100-4, I realize it equals 96 but what? Can anyone explain to me why it went by 100? What am I missing here? __________________ For great info on do-it-yourself auto repair and maintenance: www.ericthecarguy.com (warning: When getting into the harder areas some car knowledge is recommended)
 February 28 2013, 08:44 PM #2 junxon Fleet Captain     Location: I'm a Romulan now. Romulans are cool Re: Math question that just seems ridiculously overcomplicated __________________ I'm your Venus, I'm your fire, At your desire, Captain. - Mr Spock Hello to Jason Isaacs!
 February 28 2013, 08:50 PM #3 Shaytan Vice Admiral     Location: Paris, Fr, EU. Re: Math question Because the exemple illustrates negative integers and distributive property ? __________________ Not on strike.
 February 28 2013, 09:36 PM #4 Rhubarbodendron Fleet Captain     Location: Milky Way, outer spiral arm, Sol 3 Re: Math question yes, precisely. They needed an example for multiplying the opposit of a sum. the way you did was multyplying sums. Nothing wrong with it at all, but not what they wanted to explain. Actually the 100-4 makes sense. You can multiply by 100 by simply adding two 0es or shifting the decimal point (or in Europe the decimal comma) two digits to the right. This is a mechanical step that doesn't require much thinking and goes quickly. Then they substract the rest. Imagine their example as: there are 25 boxes with 100 cupcakes each. Someone steals 4 cupcakes from every box. How many are left? See? Now it makes perfect sense (and a belly ache for the thief LOL) __________________ Eve is the revised, improved and updated version of Adam [Helen Vita]
 February 28 2013, 10:39 PM #5 thestrangequark Vice Admiral     Location: Brooklyn! Re: Math question They are also demonstrating that numbers can be defined many ways. 96 can be defined as 100-4 (that's where they got it from, to answer your question). Of course, 96 could also be defined as 90+6 or 8(12), etc. __________________ "I wish I had two hearts I could follow." View my art!
 February 28 2013, 11:18 PM #6 Asbo Zaprudder Rear Admiral     Location: Chairman of the bored Re: Math question ...or 4 x 24, which makes obtaining the answer trivial. __________________ "It is a lonely life, the way of the necromancer... oh, yes. Lacrimae Mundi - the tears of the world."
February 28 2013, 11:24 PM   #7
Christopher
Writer

Re: Math question

 Kenbushway wrote: Where did they get this 100-4, I realize it equals 96 but what? Can anyone explain to me why it went by 100? What am I missing here?
Because it's easier that way. That's how I figured it out in my own head before I looked at the answer in your post. I recognized from experience that 96 is a multiple of 4 (sometimes it's just a matter of practice and experience, which is why they have us memorize multiplication tables -- or at least they did when I was a kid), and when I was trying to remind myself what it factored down to, I realized, "Hey, 96 is only 4 less than 100, and I know that 100 divided by 4 is 25, so 96 divided by 4 must therefore be 24." Which was an easy way of figuring it out. (Otherwise I would've broken it down as 80 + 16, which is (20 + 4) x 4, and that would've given me the answer.)

And that meant that 25 x 96 could also be written as 25 x (4 x 24), and you just move the parentheses and it's (25 x 4) x 24 = 100 x 24 = 2400. It's just an easier and more intuitive route to the solution.

So that's two different points where it was possible to get to 100, and that made it much easier to solve those parts. We use base-10 mathematics because we have ten fingers, so anytime you can rearrange an equation to get a 10 or 100 or the like in there, it makes it easier to solve.
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March 1 2013, 01:44 AM   #8
thestrangequark
Vice Admiral

Location: Brooklyn!
Re: Math question

 Asbo Zaprudder wrote: ...or 4 x 24, which makes obtaining the answer trivial.
The answer's not the point, though. Learning about distributive property is.
__________________
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View my art!

March 1 2013, 03:33 AM   #9
Kenbushway
Commander

Location: Georgia
Re: Math question

 Shaytan wrote: Because the exemple illustrates negative integers and distributive property ?
thestrangequark wrote:
 Asbo Zaprudder wrote: ...or 4 x 24, which makes obtaining the answer trivial.
did you miss the part where I said I am bad a math, I will try again, I am worst than stupid when its comes to math.

The answer's not the point, though. Learning about distributive property is.
Yes. I have learned recently to not worry so much about finding an answer but learning the process and many different ways to look at it, one of the reasons I bought this book, saw it the reviews that it explained different ways to do math.
__________________
For great info on do-it-yourself auto repair and maintenance:
www.ericthecarguy.com
(warning: When getting into the harder areas some car knowledge is recommended)

 March 1 2013, 03:54 AM #10 thestrangequark Vice Admiral     Location: Brooklyn! Re: Math question ^Hey, fix that quote, boy! I'm good at math! __________________ "I wish I had two hearts I could follow." View my art!
 March 1 2013, 06:01 AM #11 Nerys Myk Admiral     Location: House of Kang, now with ridges Re: Math question When I signed up I was told there would be no math. I think it's in the FAQ. My math score was so low on my SATs, I think they had to go negative. __________________ Nerys Myk's Midnight In Never Land A novel of Dark Fantasy @ Amazon.com
March 1 2013, 11:16 AM   #12
Jim Gamma
Rear Admiral

Location: London
Re: Math question

 Christopher wrote: anytime you can rearrange an equation to get a 10 or 100 or the like in there, it makes it easier to solve.

This is very true. There are lots of "tricks" you can use - like knowing the digits of anything divisible by 3 will, themselves, sum up to something divisible by 3.

For example:

1386486

Sum the digits: 36.
Sum the digits again: 9.

So it's divisible by 3.

Similarly anything divisible by 9 can have its digits added up to something divisible by 9. (So 1386486 above is divisible by 9.)

You learn them mostly through experience, but also sometimes through being taught them.
__________________
My LJ
TrekBBS LJ community
(AKA Jim Gamma)

 March 1 2013, 12:48 PM #13 Scout101 Admiral     Location: Rhode Island, USA Re: Math question Book method makes perfect sense. It's stupid-easy to figure out what 100 x anything is, so you can get to 2500 instantly. Then, since you only needed 96 of them instead of 100, just take 4 back off, so -100. Breaking it into 90 and 6 doesn't help... __________________ Perhaps, if I am very lucky, the feeble efforts of my lifetime will someday be noticed and maybe, in some small way, they will be acknowledged as the greatest works of genius ever created by man. ~Jack Handey STO: @JScout33
 March 1 2013, 01:39 PM #14 Asbo Zaprudder Rear Admiral     Location: Chairman of the bored Re: Math question Thank the Indians for the zero and place-value notation. __________________ "It is a lonely life, the way of the necromancer... oh, yes. Lacrimae Mundi - the tears of the world."
 March 1 2013, 02:11 PM #15 SmoothieX Vice Admiral     Location: Massachusetts Re: Math question To the OP...Order of Operations. Also, buy a calculator.

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