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Serene Koon

Asked 8 years ago

SG Primary 6 Number and Algebra

Please help. Thanks

Replies 1

Serene Koon

(a) 20% of 600 chairs ---- 120 20÷3 = 40 chairs (b) 600 ÷40 = 15 rows

5 years ago

Serene Koon

Asked 8 years ago

SG Primary 6 Measurement

Please help. Thanks

Replies 2

Tjew Sheng Wei

5 years ago

Yeo See Yeong

5 years ago

Jesline Goh

Asked 8 years ago

SG Primary 5 Number and Algebra

Saw a similar question posted but I still don't quite get it. Please help with models please. Thanks!

Replies 10

BA Poh Ann

5 years ago

Yueh Mei Liu

Assume you first give each pupil 5 candies and have 3 candies left. Now you decide that you want to give each pupil 6 candies. You would take the extra 3 candies and give each pupil a candy (from 5 to 6), but there will be some pupils who could not have 6 candies because the question says that there will be 7 candies short. So, if we are able to get 7 candies somewhere, then we will be able to give all the pupils a candy each. 3 candies + 7 candies = 10 candies. Since I give 1 candy (6 - 5) to each pupil, I would have given to 10 pupils. Hence there are 10 pupils. If you know the number of pupils, you can find the number of candies in total.

5 years ago

Yueh Mei Liu

Above is the reasoning and explanation for understanding. The working steps are just 3 +7 = 10; 6-5=1; 10/1 = 10 pupils.

5 years ago

KH Puah

5 years ago

AisinGioro YongZhen

Suppose we have n units of 5 candies where each unit denotes a student receiving it with a surplus of 3 candies after distributing all to the student. Now when 6 candies are distributed to each students we have a shortage of 7, so we consider the first case where there is 3 surplus candies, we take 1 candy and give to the 1st student and he has 6 candies with 2 surplus, and we take the 2nd candy and give to the 2nd student and he has 6 candies with 1 surplus, and 3rd student has 3 candies with 0 surplus, and 4th student has 6 candies with -1 surplus (i.e shortfall of 1), and 5th student has 6 candies with -2 surplus, so on until the 10th student with 6 candies with -7 surplus ( i,e shortfall of 7).

5 years ago