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 Post subject: Adding Fractions
PostPosted: Wed Nov 07, 2018 9:14 am 
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Joined: Tue Oct 09, 2018 12:36 pm
Posts: 56
Location: bradford
How to add fractions with different denominators
Like 2 1/4, 3 5/8

Its a whole number with fractions


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 Post subject: Re: Adding Fractions
PostPosted: Wed Nov 07, 2018 9:23 am 
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Joined: Mon Jan 24, 2011 4:33 pm
Posts: 1762
I would turn each into an improper fraction then add the two improper fractions together using a common denominator. Then turn the answer back into a mixed fraction if required.

Is this an 11+ topic?


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 Post subject: Re: Adding Fractions
PostPosted: Wed Nov 07, 2018 9:35 am 
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Joined: Tue Oct 09, 2018 12:36 pm
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Location: bradford
yes , its 11+ topi

can someone reply with easy steps or 9 years old
please


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 Post subject: Re: Adding Fractions
PostPosted: Wed Nov 07, 2018 9:53 am 
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Joined: Wed Sep 02, 2015 9:56 am
Posts: 283
haniya11plus wrote:
can someone reply with easy steps or 9 years old please

Can your child add fractions with different denominators, using the concept of equivalent fractions? Can he/she add 1/4 and 5/8 by turning the 1/4 into 2/8?

The whole numbers should look after themselves.


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 Post subject: Re: Adding Fractions
PostPosted: Wed Nov 07, 2018 9:54 am 
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Joined: Fri Mar 10, 2017 4:06 pm
Posts: 554
Change 2 1/4 into eighths.

Then it should be straightforward to add the two fractions together.


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 Post subject: Re: Adding Fractions
PostPosted: Wed Nov 07, 2018 10:07 am 
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Joined: Mon Feb 12, 2007 1:21 pm
Posts: 16126
Year 5 content:
* recognise mixed numbers and improper fractions and convert from one form to the other and write mathematical statements > 1 as a mixed number (e.g. 2/5 + 4/5 = 6/5 = 1 1/5)
* add and subtract fractions with the same denominator and multiples of the same number

Wait until it has been taught in school.


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 Post subject: Re: Adding Fractions
PostPosted: Wed Nov 07, 2018 10:12 am 
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Joined: Mon Jan 24, 2011 4:33 pm
Posts: 1762
Guest55 wrote:
Wait until it has been taught in school.

+1


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 Post subject: Re: Adding Fractions
PostPosted: Wed Nov 07, 2018 10:14 am 
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Joined: Mon Jan 24, 2011 4:33 pm
Posts: 1762
haniya11plus wrote:
yes , its 11+ topi

can someone reply with easy steps or 9 years old
please

I think you have more fundamental maths problems to address first. A week ago your daughter was 10.


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 Post subject: Re: Adding Fractions
PostPosted: Wed Nov 07, 2018 10:25 am 
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Joined: Tue Dec 16, 2008 5:08 pm
Posts: 1714
Hello Haniya,

I have tried to give a little breakdown if it helps your child.

2 1/4 + 3 5/8

a) turn each part into improper fraction

2 1/4 = ((2x4)+1)/4 = 9/4
3 5/8 = ((3x8)+5)/8 = 29/8

b) now add each improper fraction by making a common denominator

9/4 + 29/8 = 18/8 + 29/8 = 47/8

c) convert the answer back to proper fraction

Dividing 47 by 8 gives quotient of 5, and leaves a remainder of 7

47/8 = 5 7/8

OR

You could simply add the whole numbers separately and fraction part separately

2 1/4 + 3 5/8

(2+3) + (1/4 + 5/8)
5 + (2/8 + 5/8)
5 + 7/8
47/8 = 5 7/8


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 Post subject: Re: Adding Fractions
PostPosted: Wed Nov 07, 2018 10:27 am 
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Joined: Tue Oct 09, 2018 12:36 pm
Posts: 56
Location: bradford
Guest55 wrote:
Year 5 content:
* recognise mixed numbers and improper fractions and convert from one form to the other and write mathematical statements > 1 as a mixed number (e.g. 2/5 + 4/5 = 6/5 = 1 1/5)
* add and subtract fractions with the same denominator and multiples of the same number

Wait until it has been taught in school.



I agree ,
thanks


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