Maths HELP plz plz plz

musiqkid · 2008-01-22 00:35:13

Can someone help me out with this equation
300÷990=
350÷890=
60÷470=
2000÷2910=

I don't want the exact answer i need the steps e.g the working outs like the one below plz help
Answer =0.530
750 3980
3750
2300
2250
50

NullRoot · 2008-01-22 01:48:08

I hope you learned long division or else this might be right over your head, Musiqkid.

I'll walk through 300÷990 for you.
First, you need to add a few zeroes onto the end of the first number. You should know that every whole number can also be written with as many 0s after it's decimal place as you want.
For instance, 300 is the same as 300.0 and 300.00 and 300.000 and 300.00000000

When you divide a positive number by a larger positive number, it's necessary to write the smaller number like this. So you might write it down on your paper like this:
_________
990 ) 300.0000

Just ignore the decimal for now and pretend we're doing 3000000÷990. You can see that your first step is to find 3000÷990. The answer is 3 remainder 30.
Just ignore the remainder as usual and write your first answer above the problem, then subtract 3x990 from 3000 to work out the next step. Keep your answers lined up! This is very important! Your paper should look like this:

____ 3___
990 ) 300.0000
2970
30

Now bring down the next 0 and you have 300 as the next number to work with. 300÷990 is 0 remainder 990. Again, ignore the remainder and write your answer above the problem and subtract 0x990 from 300. Your problem should look like this:

____ 30__
990 ) 300.0000
2970
300
0
300

Bring down the next 0 and you have 3000 as the next number to work with. 3000÷990 was 3 remainder 30, so subtract 3x990 from 3000. Your problem should now look like this:

____ 303_
990 ) 300.0000
2970
300
0
3000
2970
30

You might be able to see a pattern forming here. We'll continue getting 0s and 3s for as long as we continue, so I'll stop now and show you how to get your final answer. Remember how I put in bold text that you should keep all this lined up? This is why.

The final step is to take the decimal point and move it straight up into the answer we obtained by our dividing. In this case, if you moved it straight up, it would go before the first three in our answer. After this final step, here's what your workings should look like:

___ .303_
990 ) 300.0000
2970
300
0
3000
2970
30

This is your final answer: 300÷990= .303 (with the 0 and 3 repeating)

Last edited by NullRoot (2008-01-24 21:18:30)

NullRoot · 2008-01-22 01:57:06

Another thought...

If you want absolutely accurate answers, you can give your answers as fractions.

Fractions, which you'll recognise as being written like this: 1/2 or 3/4 or 1/4

The line between the two numbers is actually indication that we should divide these two numbers like we did above. If you're familiar with how to reduce fractions into their simplest form, then you could do that with your equations above.

With 300÷990, for instance, this is the same as the fraction 300/990.

So 300÷990 = 300/990.

We can simplify this, though. Since both 300 and 990 are divisible by 10, we can write it as: 30/99

30 and 99 are divisible by 3. That means we can write 30/99 as 10/33.

10 and 33 are not divisible by the same numbers, so this the simplest form.

That means you can say: 300÷990 = 10/33
And you would be absolutely acurate. This might not be what your teacher had in mind, though, so be careful. You should be able to recognise what method your teacher wants you to use by what they have taught you recently.

Good luck!

Last edited by NullRoot (2008-01-22 01:58:47)

musiqkid · 2008-01-22 02:04:58

OK you are like a god send...but don't go away to fast, what u've just worked out for me has opened my eyes a lot but if i explain the problem to u then u mite understand a little bit better I'm trying to find the cost of 1g of a product so i simplified it like this 1*99 (the product 99p) so its 1*99/300 (300 is the grams) which equals 0.33 but thats where the long division comes in thats where I'm confused at. long division 300/990 because 99 is to small so u add a zero on it.

musiqkid · 2008-01-22 02:08:06

OM frickin darn.....could you tell the simplest form of 350÷890, 60÷470, 2000÷2910 you'll would be a f****** genius NO Need I thought u was talking about something i don't know i know already

Last edited by musiqkid (2008-01-22 02:28:04)

NullRoot · 2008-01-22 02:38:29

If I understand this, you need to figure out how much 1g of stuff costs, if 300g costs 99p?

You are trying here to figure out the "pence per gram". This is your hint on how to divide. "X per Y" tells you that you should divide X by Y.

So you want to do 99/300 instead!

When you add the zero on, though, remember to put in the decimal! When you divide, you can ignore it for a while so long as you make sure everything stays lined up like we did above. Then move the decimal up when you're done.

I'll do 99/300 so you can see it...

___.33_
300 ) 99.000
900
900
900
0

That's what your working should look like. Try it through yourself step by step and let me know if you run into a problem.

musiqkid · 2008-01-22 03:06:11

THANK GOD for letting that someone out there help me! OK i done exactly what you said for the i have only 3 more question to do and i seem stuck.. For the 235÷1200 I've got
1200
1175
25
But my answer is 0.195, How got that number was i did it like this 1*235÷1200=0.195 But when i do the long division i can only get 1
Same with the
2000÷2910 I get
2910
2000
910
My answer s 0.145
And the last one is
350÷890 I get
890
700
190
My answers is 0.254

Can you please help me?

That may make no sense but i hope u understand

Last edited by musiqkid (2008-01-22 03:17:34)

NullRoot · 2008-01-22 03:47:39

Sorry, Musiqkid, but I think you need to see it in action. I don't think I can explain it any better.

Try using the method found here on the main website:
http://www.mathsisfun.com/long_division3.html

musiqkid · 2008-01-22 03:49:34

Thanks for all your help then man your the BEST!

John E. Franklin · 2008-01-24 15:48:44

@ nullroot. In post #2, please edit 2790 to be 2970. The long division's subtraction is correct, however.
(3)(990)=2970 = (10)(27 + 270)
Nice tutorial though!!

NullRoot · 2008-01-24 21:17:48

Gremlins did it! It was right when I posted it! You gotta believe me!
*fixed*

Math Is Fun Forum

#1 2008-01-22 00:35:13

Maths HELP plz plz plz

#2 2008-01-22 01:48:08

Re: Maths HELP plz plz plz

#3 2008-01-22 01:57:06

Re: Maths HELP plz plz plz

#4 2008-01-22 02:04:58

Re: Maths HELP plz plz plz

#5 2008-01-22 02:08:06

Re: Maths HELP plz plz plz

#6 2008-01-22 02:38:29

Re: Maths HELP plz plz plz

#7 2008-01-22 03:06:11

Re: Maths HELP plz plz plz

#8 2008-01-22 03:47:39

Re: Maths HELP plz plz plz

#9 2008-01-22 03:49:34

Re: Maths HELP plz plz plz

#10 2008-01-24 15:48:44

Re: Maths HELP plz plz plz

#11 2008-01-24 21:17:48

Re: Maths HELP plz plz plz

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