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Adrian Ng

Asked 9 years ago

SG Primary 5 Statistics

Making it visual...

Replies 0

Adrian Ng

Asked 9 years ago

Replies 0

LyNne Ho-Poh

Asked 9 years ago

SG Primary 5 Number and Algebra

Can someone help me with the first question?thanks a million!!!

Replies 3

Caleb Tey

13*5*10 = 65*10 = 650

6 years ago

Maggie Lukes

It's a way to do multiplication mentally.

6 years ago

LyNne Ho-Poh

Thks;)

6 years ago

Lee Yuet Meng

Asked 9 years ago

SG Primary 5 Statistics

Pls help with this P5 question. Assessment book has brief worked answer but I don't understand. :P Thank you!

Replies 11

Caleb Tey

The new plate is $17. Based on the old average of $5, this platecost $17-$5 = $12 more that the average.

6 years ago

Caleb Tey

With the $12, the overall average went up by $2.

6 years ago

Caleb Tey

This means $12 is spread over some number of plates to increase average by $2.

6 years ago

Caleb Tey

$12/2 = 6. There are 6 plates at the end, and 5 plates at the start.

6 years ago

Lee Yuet Meng

I see... Let me digest and try to explain to kiddo. Thank you, Caleb Tey!

6 years ago

Lee Yuet Meng

This is the suggested solution in the assessment book. 😑 Which I don't really understand... :P

6 years ago

Lee Yuet Meng

6 years ago

Shaoyang Brandon

The answer is described in two phases. The left diagram represents an average cost of $5 but the plates are unknown. The right diagram shows an additional plate of $17. Then, $17 = $5 + a certain number of $2. = $5 + $12. How many $2 do you need to make $12? 6. So, this means 6 plates. Add in the plate that was bought and you have 7 plates. :)

6 years ago

Lee Yuet Meng

The initial number of plates bought is 5.

6 years ago

Shaoyang Brandon

Sorry. It is 6 plates. Ignore the last step of adding 1 more plate.

6 years ago

Pang Shing Hsiu

The model drawing shows a B4 and After scenario. 7-5=2 / increase in average price 17-7= 10 / difference between +1 plate vs new ave 10÷2=5 plates at first / difference in value vs change in value If you do algebra, it looks like : No. of plates = 1u 1ux5 + 17 = (1u + 1) × 7 5u + 17 = 7u + 7 2u = 10 1u = 5 If...it is a hypothetical scenario. Hence, ans key is correct. 6 plates is not the required answer. She bought 5 plates. / correct.

6 years ago