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Wednesday, December 13 2017 @ 04:48 PM CST
 Forum Index >  Test Paper Related >  Primary 4 Matters
 P4 Fractions
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By: pearldyn (offline)  Tuesday, March 02 2010 @ 09:38 AM CST (Read 2453 times)  
pearldyn

Hi, can anyone help me with this?

Mrs Mohamed bought some fruits. 2/7 of the fruits were apples.
The number of oranges was 1/4 the number of pears.
What fraction of the fruits were pears?

Answer given: 4/7

Thank you in advance!

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By: uma2ravi (offline)  Tuesday, March 02 2010 @ 08:53 PM CST  
uma2ravi

consider the total number of fruits as 1 and

therefore
2/7 of 1 (total no. of fruits) + 1/4 of Pears + Pears = 1
2/7+ 5/4 pears = 1
5/4 pears = 1 -2/7 = 5/7
pears = 5/7 x 4/5 = 4/7

oranges = 1/4 of pears = 1/4 x 4/7 = 1/7


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By: pearldyn (offline)  Wednesday, March 03 2010 @ 08:39 AM CST  
pearldyn

Hi, thanks for the reply. But I still dont understand where you get the 4/5?

consider the total number of fruits as 1 and

therefore
2/7 of 1 (total no. of fruits) + 1/4 of Pears + Pears = 1
2/7+ 5/4 pears = 1
5/4 pears = 1 -2/7 = 5/7
pears = 5/7 x 4/5 = 4/7

oranges = 1/4 of pears = 1/4 x 4/7 = 1/7

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By: nisalam (offline)  Monday, May 17 2010 @ 08:26 AM CDT  
nisalam

since there the number of oranges is 1/4 the number of pears, the total number of units of oranges and pears would be 5, of which pears make 4 units and oranges make 1 unit. That is why you divide the 5/7 by 5 then multiply by 4 (ie multiply by 4/5). hope this helps!

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By: rathanackumr (offline)  Monday, September 06 2010 @ 03:28 AM CDT  
rathanackumr

It is actually a 2part question. 2nd part deals with ratio rather than fraction. it is handled more extensively in P5 than P4.
Hope my attached answer helps. Cheers

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By: tanhuimin (offline)  Monday, September 06 2010 @ 07:20 AM CDT  
tanhuimin

Hi all,

This is a P4 question, so try to solve it by using what a P4 student has learnt. Don't need to be too complicated, u will end up confuse the student.

It is actually not a very difficult question.
Pls refer to the model.

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