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Need a new look at home or for the kid’s hideout? How about the most practical inventions or just common sense solutions to improving your house chores? Talk to the seasoned for the tried and tested. ...
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Re:Prelim questions
(Forum/ThinkingMath@OnSponge)
Hi Teresa, I think your son deserves a pat on the back. I think I am used to reading it the other way around "fraction + an additional amount" that this was overlooked. I do agree with your understanding ...
Monday, 06 September 2010
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Re:Prelim questions
(Forum/ThinkingMath@OnSponge)
... My point is 3/5 of the remaining money is after he spent $30 or before. From the solution it looks like 3/5 of the remaining money is before $30 but after the wallet. My son raise this point because he ...
Monday, 06 September 2010
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Re: P5 Maths
(Forum/ThinkingMath@OnSponge)
Yes this is correct. For the PSLE there is no boundary placed on which methods you must or must not apply. The student may choose any method to solve the question and the markers will look at the answers ...
Friday, 03 September 2010
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P5 Maths
(Forum/ThinkingMath@OnSponge)
Darryl See wrote: Hi, Perseverance Darryl is at school at the moment. I believe it's from his CA2 maths question. He posted it last night and asked me to lookout for answer from Onsponge. Looking at ...
Friday, 03 September 2010
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Re: P5 Maths
(Forum/ThinkingMath@OnSponge)
Yes, I was just looking at this question with in a live workshop with teachers :) I would approach it in a similar style by making a list of possible areas for the big and small square. Total - Big = ...
Friday, 03 September 2010
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Re:P5 maths- area of Triangle
(Forum/ThinkingMath@OnSponge)
Hi, Perseverance Darryl is at school at the moment. I believe it's from his CA2 maths question. He posted it last night and asked me to lookout for answer from Onsponge. Looking at it now, and like ...
Friday, 03 September 2010
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Re: List of combinations
(Forum/ThinkingMath@OnSponge)
... did u end up with $10, ( just looking at the min the ratio can be simplified?) At first 50c:20c 2:5 2:2 = 4(value) 10:10 In the end 50c:20c 3:5 3:2 = 5(value) 12:8 Difference in value ...
Thursday, 26 August 2010
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Re:P5 Maths
(Forum/ThinkingMath@OnSponge)
Hi actually, we would called this Unchanged Total as we are making the totals the same for each scenario. For this question we are given one person in comparison to the other three. In looking for ...
Thursday, 26 August 2010
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Re:P6 Maths
(Forum/ThinkingMath@OnSponge)
Hi there, The difference is not the "to"...this can be overlooked. However, the main issue with the sentence was knowing if they were in the tunnel or out of the tunnel at the start. In your question, ...
Wednesday, 25 August 2010
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Re:Chapter 10 Volume
(Forum/ThinkingMath@OnSponge)
... 1/2 since the Base Area remains unchanged. If you look at the question from the perspective of Base Area x Height to get the capacity. --> Base Area x Height --> 150 x 8 Increase the height to ...
Tuesday, 24 August 2010
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Re:P6 Maths - Nanyang 2007 P6 Prelim Q34 and Q35
(Forum/ThinkingMath@OnSponge)
... with n sides, where n is 3 or more, is 180⁰x(n-2)). [USER POSTED IMAGE] I'll send bluefire a message, as I know who she is :) I'll have a look at question 35 this afternoon. ...
Monday, 23 August 2010
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Re:Fraction & Ratio
(Forum/ThinkingMath@OnSponge)
Thanks with the model it looks easier ...
Monday, 23 August 2010
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Re:P6 Guess & Check
(Forum/ThinkingMath@OnSponge)
... need to recognize that the two cut out areas, while looking the same, form a square as different sides of the 1/4 circle are cut out. I have coloured this in red for better clarity. While I could solve ...
Sunday, 22 August 2010
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Re:Simultaneous Equations
(Forum/ThinkingMath@OnSponge)
... As such we need to have two sets of relationships to make a comparison. The aim is to eliminate one of the unknown amounts. Here we choose to eliminate the passed unknown, since we are looking for ...
Friday, 20 August 2010
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Re: P6 Synthesis and Transformation Help Needed
(Forum/Language & Humanities)
for the first sentence,the name Siti was used in the sentence. for the second sentence,I overlooked the word'for',my apologies ...
Thursday, 19 August 2010
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Re:Pri 5 4.3 Average with unknown quantity
(Forum/ThinkingMath@OnSponge)
Can someone explain to me how to find the unknown quantity. I've looked at the example given and the solution but I still don't get it. Johnny bought a certain no. of water bottles at an average price ...
Monday, 16 August 2010
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Pri 5 4.3 Average with unknown quantity
(Forum/ThinkingMath@OnSponge)
Can someone explain to me how to find the unknown quantity. I've looked at the example given and the solution but I still don't get it. Johnny bought a certain no. of water bottles at an average price ...
Monday, 16 August 2010
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P3thinkingMath@onSponge-Page178 Q6
(Forum/ThinkingMath@OnSponge)
Q6(b) Looking at the model, table tennis 6/15 but how do we know 2 units - 6??? Given answer 2 units - 6??? 1 unit - 3 15X3=45 Thanks. ...
Wednesday, 11 August 2010
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Re:P5 Maths - Percentage
(Forum/ThinkingMath@OnSponge)
... was Dawn had 72 (original 30% more than Kate + 42% being 3/5 given by kate). This is obviously wrong assumption. I also knew I should have look for a common multiple as taught, but just forgot to do so. ...
Tuesday, 03 August 2010
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Re:P5 Maths - Percentage
(Forum/ThinkingMath@OnSponge)
... and even look back for a mistake. I must have been deep in the mud to have been in such a muddle :) It should be: I have corrected the original a) Red --> 18/(18+25+57) x 100% --> 18% ...
Tuesday, 03 August 2010
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Re:Age Questions
(Forum/ThinkingMath@OnSponge)
While not answering your question directly, maybe looking through this flash file help you to understand the steps involved. Note: You can click the button shown in the red circle at the top right corner, ...
Wednesday, 28 July 2010
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Re:Help !
(Forum/ThinkingMath@OnSponge)
... to record the information and then Simultaneous Equations to solve it. I can share that or later I will look again. ...
Tuesday, 20 July 2010
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Re:Raffles Girls P5 SA2 Y2007 ... pls help
(Forum/ThinkingMath@OnSponge)
Hi Suzanne I do not have that question to make a quick check myself, however, I believe there is either something wrong with the question or in copying the question. If you look at the ratios I have ...
Saturday, 17 July 2010
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Re: P5 MGS SA1 2009
(Forum/ThinkingMath@OnSponge)
... pair adds to 11. Then we look at the number of pairs (the number of times we do this). In this case, there will be 5 pairs - why? Because 10/2=5. So 5 x 11=55 Once we understand this, we can start ...
Saturday, 17 July 2010
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Re: Constant Difference
(Forum/ThinkingMath@OnSponge)
... 5.6 when James is 40. Ali and May become 16.8 years old and 5.6 years old respectively. The numbers are not so nice! Perhaps not the answer the question setter was looking for. The question could ...
Friday, 16 July 2010
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Re: Repeated Identity
(Forum/ThinkingMath@OnSponge)
Tang wrote: Hello, Please check. A + B + D + E = 2 + 1 + 1 + 4 = 8 and not 7. Hi Tang, It looks like you are adding up A+B+D+E by taking the first two ratios B:A is 1:2 and D:E is 1:4. ...
Wednesday, 14 July 2010
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Re:P6 5 marks Speed Question
(Forum/ThinkingMath@OnSponge)
... this question? It is actually quite easy if you create a picture and break it down. Looking at the picture below, you can see that when the whole train is in the tunnel there is only 100m left to go ...
Monday, 12 July 2010
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Re:MODEL DRAWINGS
(Forum/ThinkingMath@OnSponge)
... Note: I could have avoided calculating the starting amount followed by calculating the amount left just by looking at the remaining units from the model on the right. Dresses left --> 1unit + 42 Skirts ...
Monday, 12 July 2010
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Re:P6 - Percentage question
(Forum/ThinkingMath@OnSponge)
Hi JC when comparing percentages we need to identify which item is the 'base'. We do this by looking at what we are comparing to / comparing against. Looking at Wed and Thur first (because both the ...
Sunday, 11 July 2010
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Re:Maths P6 Chapter 5 Q No. 6
(Forum/ThinkingMath@OnSponge)
Hi there. Sorry that I have overlooked your question. In order to get the "starting" ratio of 5:12 we use the concepts of Repeated Identity. You can see that by placing letters in each of the individual ...
Thursday, 08 July 2010
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Re: Help
(Forum/ThinkingMath@OnSponge)
For this question, we use Constant Difference. Looking at the before and after ratios, you will notice that both the square and the rectangle decrease by B where B is the shaded common part. Ratio ...
Thursday, 08 July 2010
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P5 Maths
(Forum/ThinkingMath@OnSponge)
... 72 balls in Box C now. How many balls were there in Box B? Question is not clear. Is it looking for the balls in Box B at first or in the end? A : B 1 : 2 Unit moved to box C, 0.1xu+0.1x2u 0.1u+0.2u =0.3u 20% ...
Thursday, 08 July 2010
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Re:P6--Q1 onsponge Sample Examination paper1 bookletB
(Forum/ThinkingMath@OnSponge)
Thanks. I dont have P5 book. I understand what you are explaining. Thanks alot. I look should look at things at the simplest form. Thanks again.... ...
Monday, 05 July 2010
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Re:P6 - Math Problem Solving
(Forum/ThinkingMath@OnSponge)
Hi there, just looking back through some old threads. I believe Ziggy has typed AND instead of OR. A longer way of doing this with the same results is: A bus can hold 45 children or 30 adults therefore ...
Sunday, 04 July 2010
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Re: P6 Maths
(Forum/ThinkingMath@OnSponge)
Looks good. But don't need my approval to submit a solution :) ...
Thursday, 01 July 2010
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Re:Guess and Check
(Forum/ThinkingMath@OnSponge)
... first using a simple model. Once you have done that, apply Guess and Check to determine the number of three and four legged stools. Note: I am not really guessing, instead, I am looking for a pattern ...
Thursday, 01 July 2010
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P5 Internal transfer with total unchanged concept
(Forum/ThinkingMath@OnSponge)
... take a look at my revised workings and thanks: Before Box A R : G 3u : 4u Box B R : G 2p : p 10p : 5p Half of the green marbles from Box A is transferred to Box B-> 1/2x4u=2u After Box ...
Thursday, 01 July 2010
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Re:P6 Math
(Forum/ThinkingMath@OnSponge)
Thanks for the quick reply. Now it looks easy! ...
Wednesday, 30 June 2010
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Re:Equal Stage(Type 3)
(Forum/ThinkingMath@OnSponge)
Hi there, Are you by any chance looking at Chapter 1.12 instead of 2.10? Chapter 1.12, page 2, has the solution for question 4. While Chapter 2.10, page 4, has the solutions for questions 5, 9 and ...
Wednesday, 30 June 2010
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Re:Unchanged Total
(Forum/ThinkingMath@OnSponge)
Ally, For this question, assuming the correct numbers, we would use Unchanged Total to find the answer. Using ratio, the solution would look like: A:B+C 1:3 (total 4units) 9:27 (total 36units) B:A+C 1:8 ...
Tuesday, 29 June 2010
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P5 Internal transfer with total unchanged concept
(Forum/ThinkingMath@OnSponge)
... = 104 : 80 = 13:10 Hi Chris Rogers, Looking forward for model solutions for this question and the 1st question - James and Elisa.How about the 3rd marble question? Any alternative solutions to share? ...
Tuesday, 29 June 2010
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P6 Math: External Unchanged
(Forum/ThinkingMath@OnSponge)
Can someone help with this problem sum? I found a similar question on P6,Chapter 9, Revision Q32,but still cant figure out after looking at the solution. Audrey and Belle have some money each. If Audrey ...
Tuesday, 29 June 2010
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Re:P6 Ratios - Working Backwards
(Forum/ThinkingMath@OnSponge)
working backwards looking at the second change (40% of Y is poured into X) --> before the final ratio Y had more units --> left in Y is 60% = 6units --> Y before must be 10units and decreased by ...
Monday, 28 June 2010
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Re:P5 Maths - percentage
(Forum/ThinkingMath@OnSponge)
... is 5 with each person getting 20% of 5 --> 1marble). So each person gets 2 marbles --> 2 x 5 = 10 marbles. Mr Chris Rogers, Would appreciate if you could spare some time to take a look at the ...
Thursday, 24 June 2010
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Re:P5 Maths - percentage
(Forum/ThinkingMath@OnSponge)
... Note: The question's wording 'At least .." this suggests that there would be many answers without these two words. Did you get this question from a book? Looking at the picture below: - each person ...
Wednesday, 23 June 2010
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Re:P5 Constant Difference
(Forum/ThinkingMath@OnSponge)
Hi Chris Thanks for your solution and the 'sweets'. It looks familiar but I thought it is not possible. Anyway, I understand now that it is actually a single item instead of 2 items in a single commodity. ...
Wednesday, 23 June 2010
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Re:challenging questions
(Forum/ThinkingMath@OnSponge)
arthi Looking back at your post, I see you wanted solutions based on models. Now that you see the solutions, do you see that models would not be the most appropriate / effective approach. When dealing ...
Wednesday, 23 June 2010
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Re:Patterns: Catholic 2009 prelim exam 3 paper 2 Q14
(Forum/ThinkingMath@OnSponge)
Hearty wrote: The figures below are made up of coloured dots. Look at the figures below and answer the following questions: O O O Fig 1 1 + 1 + 1 x 1 = 3 O O O O O O O Fig2 1 + 2 ...
Monday, 21 June 2010
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Re:Patterns: Catholic 2009 prelim exam 3 paper 2 Q14
(Forum/ThinkingMath@OnSponge)
The figures below are made up of coloured dots. Look at the figures below and answer the following questions: O O O Fig 1 O O O O O O O Fig2 O O O O O O O O O O O O O Fig 3 (a) ...
Monday, 21 June 2010