## Q&A - PSLE Math

### Re: Q&A - PSLE Math

The pathway is just the area of two shaded parallogram..Laurel111 wrote:

Hi, can someone please help. Answer key given is 148. Thanks.

Area = (Base 1 X Height) + Base2 X height)

= (Base1+Base2) X Height

Height = 37cm

Base1+Base 2= 4cm

Area=37 X 4 =148cm2

- Swift Formula
- BlueBelt
**Posts:**246**Joined:**Thu Jun 25,**Total Likes:**2

### Re: Q&A - PSLE Math

Try putting it into paint and resize it till 1024pixels. It's rather small.Laurel111 wrote:

Resend bigger picture. Thanks.

### Re: Q&A - PSLE Math

Sorry... but I still don't get it. Is there any other way to explain this using model drawing? Thank you.alfretztay wrote:Tom + 20 -> TimEC72 wrote:

Please help with this question. Thank you.

Tom + 30 -> Tan

3 Tom -> 410 - 50 = 360

Tom -> 120

3u -> 120

1u -> 40

5u -> 200

Ans : $200.

- alfretztay
- KiasuGrandMaster
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### Re: Q&A - PSLE Math

"Tim, Tom and Tan had $410 altogether. Tim gave 1/3 of his money to Tan. Tom then gave 2/5 of his money to Tim. As a result, Tom had $20 less than Tim and $30 less than Tan. How much money did Tim had at first?"EC72 wrote:alfretztay wrote:Sorry... but I still don't get it. Is there any other way to explain this using model drawing? Thank you.EC72 wrote:

Please help with this question. Thank you.

From "as a result, Tom had $20 less than Tim and $30 less than Tan,"

Tom + 20 -> Tim

Tom + 30 -> Tan

From "Tim, Tom and Tan had $410 altogether,"

Tim + Tom + Tan -> 410

Tom + 20 + Tom + Tom + 30 -> 410

3 Tom -> 410 - 50 = 360

Tom -> 120

Tim -> 120 + 20 = 140 (in the end)

From "Tom then gave 2/5 of his money to Tim,"

3/5 -> 120

2/5 -> 80 (given to Tim)

140 - 80 = 60

2/3 -> 60

3/3 -> 90

Ans : $90 (Tim at first)

PS : I believe one should be able to draw the model after understanding my workings with explanation above.

- Swift Formula
- BlueBelt
**Posts:**246**Joined:**Thu Jun 25,**Total Likes:**2

### Re: Q&A - PSLE Math

This is fully based on the question. Not from the solution of Tay's.EC72 wrote:Sorry... but I still don't get it. Is there any other way to explain this using model drawing? Thank you.

### Re: Q&A - PSLE Math

EC72 wrote:Sorry... but I still don't get it. Is there any other way to explain this using model drawing? Thank you.

### Re: Q&A - PSLE Math

BTW, I cannot imagine the student to do modelling method during PSLE as what I had illustrated. It's too time consuming and corrections for mistakes are messy.

I'm drilling my son to use alegebra, simultenous equation ..etc.. However that is just my opinion from a fathers' perspective. Not a qualified tutor, teacher.

I'm drilling my son to use alegebra, simultenous equation ..etc.. However that is just my opinion from a fathers' perspective. Not a qualified tutor, teacher.

### Re: Q&A - PSLE Math

Ender wrote:The pathway is just the area of two shaded parallogram..Laurel111 wrote:

Hi, can someone please help. Answer key given is 148. Thanks.

Area = (Base 1 X Height) + Base2 X height)

= (Base1+Base2) X Height

Height = 37cm

Base1+Base 2= 4cm

Area=37 X 4 =148cm2

Thanks Ender. I find it difficult to explain to son as the slanted line appears longer than straight line. I used another method, longer but probably easier to understand is to subdivide the figure into triangles and arrived at 148.