BDC AND BAD shares the same height and base. Hence they have same area. So area BAD is 8cm^2

Thank you!

The concept for (a) is that because the area of triangle is half*base*height, we can conclude that since both the base and height of triangle BAD are equal to the base and height of triangle BDC, the area of the two triangles are also equal.

can you please explain your model Vei Li Soo

I drew the blue showing 2 : 3, then added the orange for 7 : 4, bearing in mind that the lengths for both classes must be equal. After that, I realised that I can compare (and align -- see the dotted lines) the orange units and blue units for both classes to conclude that 3 orange equal 1 blue.

For both classes, there are 4 orange units at the end and 2 blue units at the start, so I can conclude that the extra blue unit in 5B is equal to the 3 extra orange units from 5A (I shaded them green).

ur model is alr wrong

180m should be the protruding portion.

400m shld be place where? Pls advise..

400m shd be Ronald.

Ok then below ruth will be 180?

Assuming you placed 180at the right place and the total is meant to be 400, it would mean Ruth ran 220m. That's not possible because Ruth ran less than Ronald. That's how we check for reasonableness.

You can try to put the numbers into the diagram and then see if they fit the lengths of the bars.

Something like this?

That's right! You are getting the hang of it 😊

Yoohoo!! Thankss!! Tonight will teach my daughter to complete her hw!!

Try Ronald ran 400m and see if it makes more sense that way.

Get your daughter to try it out without your help. Then ask her questions about whether her answers are reasonable, plus get her to explain her thinking. These processes are more valuable than the answers.

Sorry, I only saw all the other comments after I posted mine. Was a bit slow of me 😜

That's alright, Chantelle Swanepoel 😊

Thanks Vei Li Soo!!

So meaning there will be 2 answers? Depending on how u view the questions?

Yes, there's more than one possible answer. The other solution involves division. If your daughter has learnt how to draw that type of model, then she could offer that as an alternative solution.

Thanks Vei Li Soo..sorry Linda, I shld chk w u if your child has learnt models involving division😁

No worries, Claudia Tan. It's good to look at more than one way to solve a problem.

Ya..my gal in P3. Shall test her n see how she gona view this question. .hehe! !

Thanks Claudia Tan too!!

My view is that the student think that the blanks are to be filled-up by the helping words ONLY..which is not the case here.. Initially that is what I think..LOL

Thanks.

Assumption method

Thank u