Q&A - PSLE Math

[Poonie]

James Ang:

Poonie:

Hi James Ang


I also have a Math question. Hope you can assist.

It is a P3 question and I believe they are not allowed to use Algebra method to solve it. I can only solve it using our good old algebra method. Can you teach me how to explain to my girl using P3 methods?

X - Y = 300
X + Y = 500
What is the value of Y?

add up both statements;

X+X -Y +Y = 300+500
X + X =800
X = 400
Y= 500-400 = 100

The value of Y is 100

Thanks James.

[James Ang]

Poonie:

James Ang:

[quote=\"Poonie\"]Hi James Ang


I also have a Math question. Hope you can assist.

It is a P3 question and I believe they are not allowed to use Algebra method to solve it. I can only solve it using our good old algebra method. Can you teach me how to explain to my girl using P3 methods?

X - Y = 300
X + Y = 500
What is the value of Y?

add up both statements;

X+X -Y +Y = 300+500
X + X =800
X = 400
Y= 500-400 = 100

The value of Y is 100

Thanks James.[/quote]no problem.

[Cheerfuldad]

James Ang:

Cheerfuldad:

HI atrecord,


This is a P5 question.

Same here, could you show me the step to get 7 boys.

TIA

3 + 4 = 7 boys.

This is a logical way to solve it so simply (compares to making a list, guess and check etc). Each boy gets 1 more chip (9 pieces increase to 10 pieces) and the 4 extra pieces becomes 3 pieces short, means 4 pieces were eaten and need another 3 pieces, so total there are 4+3=7 boys since each boy eats one more piece. Most P5 children can understand this logic.

HI James Ang,

You have made my day! I showed your method to my child and he can understand the concept.

Thank you!

[leesf]

A & B share some beads. If A gives B 1/3 of this share, B would have 70 beads more than A. If A gives B 1/5 of his share, B would have 10 beads more than A. How many beads do A have at first?

[BusyB]

1/3 - 1/5 = 2/15


2*2/15 of A’s share = 70-10 (note: after A give to B, diff between them is 2 times the share given as B gain 1 share and A deduct 1 share)

4/15 of A’s share = 60
1/15 of A’s share = 15

A’s share - 15 * 15 = 225

[James Ang]

Cheerfuldad:

HI James Ang,


You have made my day! I showed your method to my child and he can understand the concept.

Thank you!

That's great! Once the kids can understand the key concepts, Maths becomes fun and interesting.

[leesf]

BusyB:

1/3 - 1/5 = 2/15


2*2/15 of A's share = 70-10 (note: after A give to B, diff between them is 2 times the share given as B gain 1 share and A deduct 1 share)

4/15 of A's share = 60
1/15 of A's share = 15

A's share - 15 * 15 = 225

Hi busyB,

Thanks for your answer. From where can tell diff b/w A & B is 2 times?

[kitty2]

Anyone has Red Swastika School Ca1 Maths answer sheet?My dd lost the answer sheet.If you've please share with me the answers.


Thanks :udawoman: :udaman:

[firebird]

Good morning


Please help me on the following maths question:

A fruit seller had a total of 204 red and green apples in the ratio of 9:8. After selling an equal number of each type of apples, the number of red and green apples left was in the ratio of 9:5. How many apples did he sell altogether?

Many thanks.

[mathsparks]

mods, pls merge with http://www.kiasuparents.com/kiasu/forum/viewtopic.php?p=131282#131282