Kunena Site Syndication http://www.onsponge.com/ Mon, 06 Sep 2010 11:52:07 +0800 Kunena 1.5.4 http://www.onsponge.com/components/com_kunena/template/default/images/english/emoticons/rss.gif http://www.onsponge.com/ Kunena Site Syndication http://www.onsponge.com/forum/35-thinkingmathonsponge/4634-prelim-remainder-concept.html#4652 Chris Rogers wrote: Yes you are correct. John drove at a constant speed from his house to Town B. On his way, he passed Town A. At 9.20am he was 383 km from Town B and 205 km from Town A. At 12.50 pm he stopped at a petrol kiosk which was midway between Town A and Town B. At what speed did John drive before he came to the petrol kiosk? If you work it out in the order the information is presented, you will arrive at an answer with many decimal places which rounds out to 25.4km/h. In addition, he is travelling for too slow for the question to make sense. However, if you read such that at 9.20am he has yet to pass Town A, then the solution works out to a whole number - 84km/h. This is also logical from a speed point of view. I believe this question could be written a little better by removing this entire sentence "On his way, he passed Town A." Thanks for the questions Just to share. Solution by Dharma (http://www.postimage.org/image.php?v=TsMZA80) for the above speed question to get answer as a whole number - 84 km/h. Only the name in the question was changed but the rest remained the same.Curious to know the source of this question, any idea? Sorry for the blunder in the earlier question-lucky draw as I didn't read the question carefully. Mon, 06 Sep 2010 06:53:02 +0800 http://www.onsponge.com/forum/35-thinkingmathonsponge/4643-maths-p6-model-drawing.html#4649 There were a total of 510 chocolates and sweets in a box. Gina sold 20% of the chocolates and bought another 40 sweets. After that the number of sweets in the box was 1/8 of the number of chocolates in the box. a)How many chocolates were there at first? b)How many more chocolates than sweets does he have now? And for the Model Drawing solution. http://www.onsponge.com/images/fbfiles/images/forum_2010_09_05_model_drawing.jpg PS. Perseverance you are really fast tonight !!! Sun, 05 Sep 2010 23:55:43 +0800 http://www.onsponge.com/forum/35-thinkingmathonsponge/4641-p6-circles-qplease-help-q.html#4647 You can find this question on Page 57 of the onSponge P6 +hinkingMath book - Question number 8. Note: The answer is the solution on the left 200cm2. For information, you can see the area of the shaded part 114cm2. http://www.onsponge.com/images/fbfiles/images/forum_2010_09_05_c2.jpg Sun, 05 Sep 2010 23:14:05 +0800 http://www.onsponge.com/forum/17-bonding-with-kids/4642-abundant-parenting-motivating-your-child.html#4642 MaDiff is organizing a lunch time talk by a Educational Psychologist. Please email me or info@madiff.com.sg to learn more. Sun, 05 Sep 2010 18:45:55 +0800 http://www.onsponge.com/forum/35-thinkingmathonsponge/4614-p5-maths-area-of-triangle.html?limit=10&start=10#4640 Hi, Chris Okay, I will post the teacher's solution once I got it from Darryl. Oic, in other words, there were 2 posts of the same question, 1 from Darryl and the other from an Observer's blog around the same time. That is indeed a timely coincident. Sun, 05 Sep 2010 11:04:29 +0800 http://www.onsponge.com/forum/35-thinkingmathonsponge/4611-p6-model-drawing.html#4630 Jin Chew wrote: Thanks Perseverance for your help. Could u explain how do you get 15units for Q2? LCM of 3 and 5 is 15. Are you a parent or P6 student? Fri, 03 Sep 2010 22:20:41 +0800 http://www.onsponge.com/forum/27-products-a-services/4595-maths-tutor.html#4627 Hi Yap. I didn't see any replies here so just to make sure you are aware that there is a tutor matching service here http://www.onsponge.com/learn/tutors-onsponge.html If you complete and submit the form, one of the onSponge team will contact you. Chris Fri, 03 Sep 2010 13:53:31 +0800 http://www.onsponge.com/forum/35-thinkingmathonsponge/4620-p5-nanyang-2009-sa2-paper-2-q17-working-backwards.html#4625 Jennifer Tan YP wrote: Seems like a simple question but it became a curve ball for me! Pls help! This is a 5-mark question from Nanyang 2009 P5 SA2 paper 2 Q17. Since it's a 5-mark question, it's not a simple question but also not a difficult one.What you have to do is to accept Working backwards strategy. Jennifer Tan YP wrote: Jolene and Penny had a sum of money. Jolene gave Penny 0.4 of her money. Penny then gave Jolene 1/2 of her money. In the end, Jolene had three times the amount of money that Penny had. If Jolene gave Penny $125 more than what Penny gave Jolene, how much moeny did JOlene have at first? End Jolene: 3u Penny: u Before Jolene: 2u Penny: 2u At first Jolene: 2ux5/3 = 10u/3 Penny: 2u/3 Jolene gave Penny-> 4u/3 Penny gave Jolene-> u 4u/3-u -> $125 u/3-> $125 u-> $125x3 = $375 At first, amount of money that Jolene had = 10u/3 = 10/3x$375 = $1250 Fri, 03 Sep 2010 13:05:40 +0800 http://www.onsponge.com/forum/35-thinkingmathonsponge/4608-past-psle-questions-2910.html#4619 orchid wrote: (2) answer is 5/9. Move the second square P in alignment with the first square P and third square P. You will get 3 squares laying on top of each other on one 1 side of the square ABCD. Given that area of circle Q = area of square P. So, after moving the 2nd square P to the left, you will find that the another square P or circle Q can be filled in the middle of the bottom side of square ABCD. Total number of square P = 3x3 = 9 to find up 1 whole area of square ABCD. Shaded = 9-4 = 5 square P or 5 circle Q (it doen't matter much as ratio is involved). Fraction of the square ABCD that is shaded = 5/9 Fri, 03 Sep 2010 11:47:18 +0800 http://www.onsponge.com/forum/35-thinkingmathonsponge/4609-ridiculous-riddles.html#4616 Well done Pauline. Here is a process for such puzzles. http://www.onsponge.com/images/fbfiles/images/forum_2010_09_03_puzzle1.jpg Step 1. Add the row and columns up identifying which row/columns are not multiples of 4. Highlighted in blue in this table. Step 2. In purple, record those columns that are already divisible by 4 and should not change. Step3. Starting from the 1st row circled in row. Try 23-9=14 --> cannot be 9, 23-6=17--> cannot be 6, 23-7=16 --> good. Record the new total in the purple column. Step 4. Repeat using the 3rd row noting that there must be two changes to affect two columns and you cannot change the 7 as it will affect the 4th column. Thus you must drop the 9 & 2. Fri, 03 Sep 2010 10:47:50 +0800 http://www.onsponge.com/forum/35-thinkingmathonsponge/4597-p5-maths-external-changed-a-gap-a-difference.html#4607 Chelsea Chong wrote: Hi, need help with the following 2 questions. Thank you. Q1. Mary had thrice as many sweets as chocolate bars. After giving away 55 sweets and 16 chocolate bars, she had thrice as many chocolate bars as sweets left. How many sweets did she have in the end? set the sweets she had in the end as one unit (u), so the chocolate bars she had at first were (3u+16), the sweets she had at first were thrice as many as chocolate bars which were 3*(3u+16). ====> 3*(3u+16) - u =55 9u+48-u=55 8u=7 u=0.875 Attached image is the module for your reference. http://www.onsponge.com/images/fbfiles/images/math.JPG Thu, 02 Sep 2010 16:11:40 +0800 http://www.onsponge.com/forum/36-science/4605-plants.html#4606 Short Answer: Plants give out carbon dioxide both in the day and night. Oxygen is the result of photosynthesis in the day. Thu, 02 Sep 2010 14:02:19 +0800 http://www.onsponge.com/forum/35-thinkingmathonsponge/4602-p6-speed-common-distance.html#4604 Thank you chris Wed, 01 Sep 2010 06:01:04 +0800 http://www.onsponge.com/forum/35-thinkingmathonsponge/4593-chanllenging-math-problem.html#4601 ya is correct is taken from my mock exam 2 in my school but what is the steps??? Tue, 31 Aug 2010 21:14:39 +0800 http://www.onsponge.com/forum/35-thinkingmathonsponge/4585-converting-fractions-into-decimals.html#4600 Hi, thank you so much for the help. I appreciated it very much. :) Tue, 31 Aug 2010 18:28:14 +0800 http://www.onsponge.com/forum/35-thinkingmathonsponge/4596-p3-rosyth-2008-sa1-math.html#4598 Wendy had 55 more stickers than Susan . After Wendy gave away 155 of her stickers to Yvonne, Susan had 3 times as many stickers as Wendy. How many stickers did Susan have? You can draw this with one or two pictures (before and after). http://www.onsponge.com/images/fbfiles/images/forum_2010_08_31_model.jpg Tue, 31 Aug 2010 17:43:05 +0800 http://www.onsponge.com/forum/35-thinkingmathonsponge/4578-p6-circle.html#4592 Hi, hope this help A (area of shaded part of big circle) O (area of overlap part) C (area of shaded part of small circle) Difference in the shaded part --- (A+O) - (C+O) = A - C A+O -- area of big circle C+O -- area of Small circle Mon, 30 Aug 2010 19:45:38 +0800 http://www.onsponge.com/forum/36-science/4043-p6-science.html#4591 Q1) It is so that the water in the pond would not evaporate i think so! Mon, 30 Aug 2010 18:48:44 +0800 http://www.onsponge.com/forum/35-thinkingmathonsponge/4510-pri-5-external-changed-aka-total-change.html#4590 P = parts :) Mon, 30 Aug 2010 18:39:49 +0800