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 Post subject: cubes within cubes
PostPosted: Fri Oct 03, 2014 11:02 am 
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Joined: Thu Oct 18, 2012 9:41 am
Posts: 434
Small cubes measuring 2 x 2 x 2 cm are put into a larger box measuring 5 x 9 x 6
(6 is the height of the box, so the base is actually 5 x 9) as per the picture on the paper.

a) what is the largest number of small cubes which could fit into the bottom layer of the box,

so DD said that it was essentially an area question, so worked out 45cm2 / 4 cm2 so 11 can fit into the bottom layer.

but then when we drew it out, it seems to be 8 (lining up 4 along the length of 9 cm) and then another row next to that one.

Any ideas - :oops:

Thanks
Sleepyhead


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 Post subject: Re: cubes within cubes
PostPosted: Fri Oct 03, 2014 11:19 am 
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Joined: Mon Feb 12, 2007 1:21 pm
Posts: 11933
Yes - this is designed to catch out people that just divide areas/volumes!

You need to look at how many fit along each side as your method did.


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 Post subject: Re: cubes within cubes
PostPosted: Fri Oct 03, 2014 11:23 am 
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Joined: Thu Oct 18, 2012 9:41 am
Posts: 434
thank you


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