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 Forum Index >  Test Paper Related >  Primary 6 Matters
 Pri 6 Maths problems - pls help
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By: Angela.S (offline)  Monday, August 23 2010 @ 12:31 AM CDT (Read 2201 times)  
Angela.S

Q1. ) Debbie wanted to sell a pair of earrings. She moved the decimal point one place to the left by mistake when she was typing the price tag for the earrings. If she did not correct her mistake, she would sell the earrings for $1,659.33 less than the actual selling price. What was the actual selling price of the pair of the earrings?




Q2.) Clement has a wooden block measuring 50cm by 70cm by 90cm. He wanted to cut out some little cuboids measuring 2cm by 3cm by 4cm. What was the minimum amount of wood wasted?

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By: tyy809125 (offline)  Monday, August 23 2010 @ 07:30 AM CDT  
tyy809125

See attached...

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By: Angela.S (offline)  Monday, August 23 2010 @ 07:43 PM CDT  
Angela.S

Thank you but ans for Qn 2 is 360cm3.

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By: lemofish (offline)  Monday, August 23 2010 @ 08:05 PM CDT  
lemofish

Q1. ) Debbie wanted to sell a pair of earrings. She moved the decimal point one place to the left by mistake when she was typing the price tag for the earrings. If she did not correct her mistake, she would sell the earrings for $1,659.33 less than the actual selling price. What was the actual selling price of the pair of the earrings?

Let the actual selling price be $U.
When the decimal point is moved one place to the left, it becomes $0.1U and it's $1659.33 less tah actual selling price.

Therefore,
$U=$0.1U+$1659.33
$0.9U=$1659.33
U=$1843.70



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By: tyy809125 (offline)  Tuesday, August 24 2010 @ 09:31 AM CDT  
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this is definitely a better method than mine.... great learning platform. i like. Big Grin

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By: nisalam (offline)  Wednesday, August 25 2010 @ 05:26 AM CDT  
nisalam

Q2 looks tricky, but the solution is simple. First, when cutting the blocks, make sure 3cm aligns with 90cm. Depending on how you align the other sides, you will get a remaining block that is either 90*70*2 or 90*50*2. Now, you can cut more blocks from this remaining block. This time align the 3cm by the 90cm, and the 2cm by the 2cm. Regardless of the dimensions of your earlier block, you will end up with a remaining block that is 90*2*2. The volume of this block is of course 360 cubic centimetres. Hope this helps Big Grin

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By: rathanackumr (offline)  Monday, September 06 2010 @ 02:52 PM CDT  
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Question 1 Simple model method. please see attached. cheers

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