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 Post subject: succeed in maths
PostPosted: Fri Feb 22, 2013 10:31 am 
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Joined: Tue May 15, 2012 5:03 pm
Posts: 15
hi need help working theses fractions as follows..
a: 1/9+7/9=
b: 2/5+2/3=
c: 5/8+1/2=
d: 5/6+1/9=

subtract
i: 7/8-1/2=
j: 3/4-1/3=
k: 5/8-1/2=
l: 8/11-2/3=
m: 11/15-3/5=

thanks gilbertstone


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 Post subject: Re: succeed in maths
PostPosted: Fri Feb 22, 2013 10:55 am 
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Joined: Mon Jun 18, 2007 2:32 pm
Posts: 6966
Location: East Kent
To add or subtract fractions you need to make sure they have a common denominator.


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 Post subject: Re: succeed in maths
PostPosted: Fri Feb 22, 2013 11:43 am 
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Joined: Tue May 15, 2012 5:03 pm
Posts: 15
hi yoyo123 thank you fer your response could you please give me a example thanks gilbertstone


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 Post subject: Re: succeed in maths
PostPosted: Fri Feb 22, 2013 11:56 am 
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Joined: Mon Jun 18, 2007 2:32 pm
Posts: 6966
Location: East Kent
if you google adding and subtracting fractions you will find what you are looking for


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 Post subject: Re: succeed in maths
PostPosted: Fri Feb 22, 2013 2:35 pm 
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Joined: Tue May 15, 2012 5:03 pm
Posts: 15
thank you very much.


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 Post subject: Re: succeed in maths
PostPosted: Sat Feb 23, 2013 5:57 pm 
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Joined: Sun Jan 20, 2013 10:22 am
Posts: 73
one example i picked up for you


2/5+2/3=

(15/5*2) + (15/3*2)
----------------------
15

6 + 10
----------
15

16
--
15


Last edited by goldenstar on Sun Feb 24, 2013 12:49 pm, edited 1 time in total.

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 Post subject: Re: succeed in maths
PostPosted: Sat Feb 23, 2013 6:55 pm 
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Joined: Mon Feb 12, 2007 1:21 pm
Posts: 11954
check that example ...


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 Post subject: Re: succeed in maths
PostPosted: Sat Feb 23, 2013 6:57 pm 
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Joined: Wed Jan 18, 2012 11:41 am
Posts: 4604
Location: Essex
goldenstar wrote:
one example i picked up for you


2/5+2/3=

(15/5*3) + (15/3*2)
----------------------
15

9 + 10
----------
15

19
--
15


:?:

2/5 + 2/3 converted to /15 = (2*3)/(5*3) + (2*5)/(3*5)

= 6/15 + 10/15

= (6+10)/15

= 16/15

= 1 1/15

You can check this by converting to percentages: 2/5 = 40%, 2/3 = 67% (approx), which would be c.107%. 19/15 (1 4/15) is nearer to 125%.

_________________
Outside of a dog, a book is a man's best friend. Inside of a dog it's too dark to read.Groucho Marx


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 Post subject: Re: succeed in maths
PostPosted: Sat Feb 23, 2013 8:06 pm 
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Joined: Mon Aug 22, 2011 8:20 pm
Posts: 1706
Location: Warwickshire
Clues:
a: 1/9+7/9= this one should be straightforward
b: 2/5+2/3= convert this into 15ths (?/15+?/15)
c: 5/8+1/2= convert this into 8ths (5/8+?/8)
d: 5/6+1/9= convert this into 18ths (?/18+?/18)

subtract
i: 7/8-1/2= convert this into 8ths (7/8-?/8)
j: 3/4-1/3= convert this into 12ths (?/12-?/12)
k: 5/8-1/2= convert this into 8ths (5/8-?/8)
l: 8/11-2/3= convert this into 33rds (?/33-?/33)
m: 11/15-3/5= convert this into 15ths (11/15-?/15)


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 Post subject: Re: succeed in maths
PostPosted: Sun Feb 24, 2013 1:34 am 
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Joined: Sun Sep 23, 2012 6:58 pm
Posts: 208
a basic £7.99 calculator will do this for you:

http://www.amazon.co.uk/Casio-FX-83GTPL ... 001O3IF9U/


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