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Monday, July 24 2017 @ 09:50 AM CDT
 Forum Index >  Test Paper Related >  Primary 4 Matters
 Before and After Concept
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By: pearldyn (offline)  Monday, June 28 2010 @ 09:33 AM CDT (Read 1522 times)  
pearldyn

Hi again friends! How are you guys? How's your children's SA1 score?
Mine dropped a lot for his maths! Used to be a band 1 now a band 3 !!

I need help again with maths. This is the question:-

Terry had $90 more than Rosana.
After Rosana had spent $60, Terry had four times as much money as she had left.
How much did Terry have at first?


Thank you in advance!!

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By: belle (offline)  Monday, June 28 2010 @ 10:04 AM CDT  
belle

Faced almost similar prob too... Appreciate help too.

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By: ron2003 (offline)  Tuesday, June 29 2010 @ 10:21 PM CDT  
ron2003

Hi,

Pls took a look at the attached solution using models. A brief explanation here:

Step 1: Draw the before model, with Terry having 90 more.
Step 2: Label in the before model, the 60 that Rosana is going to spend
Step 3: Label in the before model, the corresponding 60 in Terry

Step 4: Draw the after model, with Rosana having spent the 60. You should try to ensure that the before and after models are roughly the same size so that your child can see it better.
Step 5: Label Terry to be 4 units and Rosana to be 1 unit, which is the interpretation for Terry having 4 times as many.
Step 6: Compare: the extra that Terry has now is 3 units, which corresponds to 120.

Step 7: Find 1 unit
Step 8: Find 4 units, which is Terry's amount (unchanged).

Do note that while there there only 3 number statements, the child has to go through is at least 8 thinking steps. Do be patient. Such questions take some time to master.

Hope this helps,
Ron
mathheuristics.blogspot.com

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By: ron2003 (offline)  Tuesday, June 29 2010 @ 10:27 PM CDT  
ron2003

Sorry people, the file attachment doesn't seem to be working.

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By: AVE (offline)  Thursday, July 01 2010 @ 03:32 AM CDT  
AVE

hi,
Terry had $90 more than Rosana.
After Rosana had spent $60, Terry had four times as much money as she had left.
How much did Terry have at first?

Model 1:
_______ |___90___|
T: |_______|________|
_______
R: |_______|

Model 2:

____|60_|___90___|
T: |___ |___|________|
___
R: |___|<-----150------->

T = 4 x R

From the above model, 1 unit is equivalent to 1 box, and 150
is equivalent to 3 units.

so 1 unit = 150 divided by 3 = 50

so Terry = 4 x 50 = $200

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