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Embarassed...sometimes CWP(2b) are too challenging for me


grantmeawish
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Have you looked at the example problems? They usually show you how to do that type of problem using bar models.

 

And yes, post the problem here, and someone will show you the bar model method of solving it. Some problems are super easy once you draw a bar model. In CWP5, I'm letting my son use algebra if it makes more sense for that problem, but sometimes the bar models are easier and you can figure out the answer without any written calculations.

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I haven't learned bar diagramming. We just started Singapore.

 

Here is the problem:

 

The total volume of water in container A and container B is 83L. Container A has 65L more water than container B. what is the volume of water in container A?

 

Thanks for help!

How's this?

 

[AAAAAAAA][bBB] = 83

[bBB][65L]

 

[bBB][65L][bBB] = 83

[bBB][bBB] = 18

= 9L

[A] = 74L

 

I think bar models are taught in Level 3. It seems to me that CWP sometimes includes concepts that are meant to be a stretch at the given level.

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I haven't learned bar diagramming. We just started Singapore.

 

Here is the problem:

 

The total volume of water in container A and container B is 83L. Container A has 65L more water than container B. what is the volume of water in container A?

 

Thanks for help!

 

I didn't look ahead at the other answers, so this is my best shot:

 

|---9---|-------------65-------------| A

 

 

|---9---| B

 

 

Total = 83 (I tried to put this vertically, but it doesn't show up that way).

 

83 - 65 = 18 (this is the amount left over in A + the total in B)

 

18/2 = 9

 

Check:

 

Container A = 65 + 9 = 74

 

Container B = 9

 

Total = 74 + 9 = 83

 

Did I get it? :bigear:

Edited by Sahamamama
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They can be solved without algebra. Although I find using algebra to solve some of them easier!

 

I have gotten tripped up on some of them too. You aren't alone. ;)

 

:iagree: The ones I tend to try to solve algebraically are generally solvable using bar diagrams...but it has been awhile since I have looked at SM level 2 so I am fuzzy on the details of that level.

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Very good! 74 is the answer. Now I am off to explain to my son who will still stare at me like I'm crazy : )

 

Thank you!

 

Actually, even though bar diagrams are great, the way Hands on Equations teaches this type of problem might connect better with some kids. MM and Beast Academy use a similar approach with a balance.

 

If you have an iPad, Dragon Box is good as a foundation.

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I frequently use algebra to solve the CWP but they CAN be solved without. It just requires a way of thinking that I was never taught. I figure out the problems ahead of time and then teach them on the wipe off board. My kids can not do them on their own. My math inclined child understands the problem easily as we do it but my non-mathy child needs lots and lots of explanation.

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How's this?

 

[AAAAAAAA][bBB] = 83

[bBB][65L]

 

[bBB][65L][bBB] = 83

[bBB][bBB] = 18

= 9L

[A] = 74L

 

I think bar models are taught in Level 3. It seems to me that CWP sometimes includes concepts that are meant to be a stretch at the given level.

 

:iagree: We always use the CWP at a level lower than we are currently working. So right now, my son just finished 3A in the text/workbook, but we are currently working through CWP 2.

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If you are unfamiliar with bar diagrams they can be a real challenge indeed! We were using 4th grade CWP and there was one that I couldn't even figure out and it was the example! I scanned it and sent it to one of my smartest friends and she said it was quite a challenge for her as well. She used algebra and then figured it out using the diagram after.

 

We haven't done CWP in a while. Lol

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