Jane Choy
Asked 9 years ago

SG chevron_right Primary 6 chevron_right Number and Algebra

P6 Question. Please help, thanks

Replies 2
Raymond Ng

6 years ago
Soo Vei Li

6 years ago

Carol Ho
Asked 9 years ago

SG chevron_right chevron_right

Thank you for adding me:)

Replies 0

Caroline Lim
Asked 9 years ago

SG chevron_right Primary 6 chevron_right Number and Algebra

Hi p6 distance speed qn. Can help?

Replies 5
Kim Soon Chin

6 years ago
Caroline Lim

Thanks Kim Soon Chin. Can you explain? As in how to know distance from midpoint to airport is 3u.

6 years ago
Soo Vei Li

6 years ago
Caroline Lim

Thanks much Vel Li.

6 years ago
Kim Soon Chin

As Michelle's speed is 5 times of Clara's, by the time they meet, the distance travelled by Michelle will also be 5 times of distance Clara travelled. Clara travelled 1 unit, Michelle would have travelled 5 units. Total 6 units (distance between airport and office). Mid point will be 6 units divided by 2, which is 3 units. The 12 km will represent 2 units (5 units-3 units). Therefore 1 unit = 6 km. Total distance = 6x6 km = 36 km.

6 years ago

Xin Yi Ng
Asked 9 years ago

SG chevron_right Primary 5 chevron_right Number and Algebra

What is the sum of all the even numbers up to 30?

Replies 11
Koh Lay Koon

2+4+...+30 = 2(1+2+...+15) = 2(16*7 + 8) = 2x120 = 240

6 years ago
Soo Vei Li

To begin, we can list some of the numbers like this: 2+4+6+8+ ....+26+28+30. Next, we can look for a pattern -- what do we notice about the sum of the first and last number (2+30), second and second last (4+28), etc? They add up to 32. How many groups of 32 are there in the list? There are 7 groups of 32 and there is also 16 which is not paired with another number. Therefore the sum is 32*7+16 = 240.

6 years ago
Xin Yi Ng

The answer given is 450

6 years ago
Xin Yi Ng

6 years ago
Koh Lay Koon

Answer sheet has careless mistakes! Shld be 7x30+30

6 years ago
Xin Yi Ng

I think so...

6 years ago
Xin Yi Ng

8x30=240

6 years ago
Xin Yi Ng

Or will that b English problem? They consider odd number too (1+29=30) .... Hence total of 15 sets 30?

6 years ago
Soo Vei Li

Answer sheets can sometimes have mistakes so we have to be sure about our methods and processes. In the answer sheet shown, it is clear that they are looking at adding only the even numbers, so it is a mistake in their solution. Even if we use a calculator to check (since it is only numbers up to 30), the answer will be 240.

6 years ago
Xin Yi Ng

Yup thx

6 years ago
Jowen Lim

Can solve the question using formula.

6 years ago

Tan Weiqiang
Asked 9 years ago

SG chevron_right Primary 5 chevron_right Number and Algebra

Hi everyone! Apologies for being away for the past few days. It was a family weekend, spending quality time with my wife and kids. But, here I am, recording another video to help you in the understanding of how to use the model method to solve some Math questions. This is a common question given to Primary 5 students. It looks very confusing but it actually is very straight forward. The trick is to understand how to approach such a question and eventually, the same approach can be used for all other types of similar questions.Here's the link to the video. Hope it helps!https://www.youtube.com/watch?v=KeNTDtonRgg

Replies 4
Boey Wai Yen

Hope you had a great Fathers' Day! Thanks for posting these questions.

6 years ago
Tan Weiqiang

Thanks Boey Wai Yen. I had a great weekend. No matter how busy I am teaching and doing my other stuff.. I always find time for my wife and kiddos.. Cheers!

6 years ago
Boey Wai Yen

6 years ago
Tan Weiqiang

Hi everyone, didn't realise that my post was removed. Apologies to the admins for contravening on the rules unknowingly. However, I believe two parents dropped me a message on my thread before it got removed. I'm sorry I didn't manage to reply in time. If you would like me to reply you, kindly drop me an email or PM. Thank you

6 years ago

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