Q&A - PSLE Math
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Sarah
Where did you get the info that rate & speed has been / would be removed? From MOE website on the topics?
I do notice that rate & speed sums are not as many as fractions, ratios, pecentages & whole numbers.
50 min for paper 1 = 1 min per MCQ & 2 min per short question, left 5 min for checking.
100 min for paper 2 = 3 min per short question and 6 min per long question, left 7 min for checking
Not only the children have to think fast, they also have to write fast. They have to practise speed from P4. -
P5 Maths question - (from Nan Hua Primary School)
Evan and Lionel hada total of 72 marbles. Evan gave 1/3 of his marbles to Lionel. Lionel then gave 2/5 of the total number of marbles he had to Evan. In the end, each of them had the same number of marbles. How many marbles did Lionel have at first? -
Please click the link below for the solution using model diagrams:
http://i3.photobucket.com/albums/y74/miamia2004/P5Math20081014.jpg -
How about this one, This is from oldschool test papers P5 math 2008
Four boys, Alex, Bryan, Calvin and Derrick, each have some stamps. The number of stamps Alex has is 1/2 of the total number of stamps Bryan, Calvin and Derrick have. The number of stamps Bryan has is 1/3 of the total number of stamps Alex, Calvin and Derrick have. The number of stamps Calvin has is 1/4 of the total number of stamps Alex, Bryan and Derrick have. If Derrick has 78 stamps, find the total number of stamps Alex and Bryan have altogether.
The answer is 210 -
cutemum:
You can use ratio to solve this question.How about this one, This is from oldschool test papers P5 math 2008
Four boys, Alex, Bryan, Calvin and Derrick, each have some stamps. The number of stamps Alex has is 1/2 of the total number of stamps Bryan, Calvin and Derrick have. The number of stamps Bryan has is 1/3 of the total number of stamps Alex, Calvin and Derrick have. The number of stamps Calvin has is 1/4 of the total number of stamps Alex, Bryan and Derrick have. If Derrick has 78 stamps, find the total number of stamps Alex and Bryan have altogether.
The answer is 210
A : B+C+D
= 1: 2
= 20: 40
B: A+C+D
= 1:3
= 15:45
A+B+D
=1:4
=12:48
First step is to make all the \"total units\" equal. So the common multiple of 3 (1+2), 4 (1+3) and 5 (1+4) is 60.
A+B = 20+15 = 35 units.
From A+B+D = 12:48
D = 48 - 35 = 13 units.
Since D has 78 stamps,
13 units = 78
1 unit = 6 stamps
A+B = 35 units = 35 *6 = 210 stamps. -
ks2me:
I always get brain damage trying to figure out models. :oops:
Please click the link below for the solution using model diagrams:
http://i3.photobucket.com/albums/y74/miamia2004/P5Math20081014.jpglizawa:
...
First step is to make all the \"total units\" equal. So the common multiple of 3 (1+2), 4 (1+3) and 5 (1+4) is 60.
... That's the missing link I was looking for. Thanks for the enlightenment, lizawa. *clap*clap*clap*
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heutistmeintag:
You are welcome. The most difficult part is always to identify the relationship among all the given numbers. Once you get that, the rest is a breeze.
That's the missing link I was looking for. Thanks for the enlightenment, lizawa. *clap*clap*clap* -
Thanks lizawa...:)
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Hi
I’m really impressed with the fact that so many parents make attempts to coach the kids and solve the problems themselves. By the way, I was recently recommended assessment books by Simon Eio. Was told its very well structured. Anyone has feedback on Andrew er’s tuition centre which he started recent years? Would you recommend it? What abt Learning Lab Math program? -
Thank you for your time.
1) Tom’s monthly allowance is $42 more than Eric’s. Eric spends $54 more than Tom every month. Eric’s savings is 1/2 of Tom’s savings. If Tom spends 3/7 of his allowance every month, what is his allowance for the entire year?
2) Siti paid $8.56 for some 26-cents, 30-cents and 50-cent stamps. She bought 4 more 30-cents stamps than 50-cent stamps. There were twice as many 26-cent stamps as 30-cent stamps. How many 26-cent stamps did she buy?
3) Terry walks to school at an average speed of 4km/h every day. One day, after walking a distance of 1km, he realised that his watch was slow. So, he ran at a constant speed and managed to reach the school just on time. Later, he calculated that if he had run at this speed right from the start of the journey, he would have reached school 5 minutes earlier. What was his running speed?
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