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 Post subject: Mental arithmetic book 6 - schofileds&simsPosted: Mon Sep 20, 2010 9:11 am

Joined: Tue Mar 02, 2010 8:20 pm
Posts: 115
Hi,

did anyone work out the section 1 Test 3 question 'c' (bookcase) ? if yes, can you tell me the answers please.

thanks

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 Post subject: Re: Mental arithmetic book 6 - schofileds&simsPosted: Mon Sep 20, 2010 9:19 am

Joined: Mon Jun 18, 2007 2:32 pm
Posts: 7062
Location: East Kent
i haven;t got the book, but if you type the question on here i am sure someone can help you work it out

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 Post subject: Re: Mental arithmetic book 6 - schofileds&simsPosted: Mon Sep 20, 2010 10:09 am

Joined: Wed Apr 25, 2007 9:08 pm
Posts: 720
Location: Not in a hole in the ground but in a land where once they dwelt-the Beormingas

1) £7.50 as he needs to buy 3 planks of wood which are £3 each per 250 cm length.

2) Total planks for 2 sides are 1 (each side of his bookcase is 110cm height- plank length available is 250cm)

3) Planks needed for top, bottom and shelves are 2. Total length of shelves is 55 x 5= 275cm, so he needs to buy 2 planks.

4) Total no. of planks to make bookcase is therefore 3. Using info from q2 and q3.

5) Total cost to buy all wood needed to make bookcase is £22.50.

6) How wide will the bookcase be, allowing for the thickness of the sides? 59cm (55 + 4cm).

7) Total length of shelves on which books can be placed is 220cm (i.e 4 x 55cm excluding top shelf)

If shelves are evenly placed, size of tallest book will be 25cm (110-10)/4 cm: each plank is 2cm thick.

9) How many 25 mm books will fit on each shelf? 22 books. (Shelf length is 55cm. Convert into mm: 550 /25)

10) 88 books to fit whole bookcase. (22 x 4)

11) Total length of wood used to make bookcase 495cm (110x2) + (5 x 55)

12) Left over wood 255cm (750-495)

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 Post subject: Re: Mental arithmetic book 6 - schofileds&simsPosted: Mon Sep 20, 2010 10:41 am

Joined: Tue Mar 02, 2010 8:20 pm
Posts: 115
Thank you very much DIY mum!

I will have to wait see who wins (DS or DH).

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 Post subject: Re: Mental arithmetic book 6 - schofileds&simsPosted: Mon Sep 20, 2010 6:22 pm

Joined: Tue Mar 02, 2010 8:20 pm
Posts: 115
Hi DIY mum,

re answer for the first question - we think it should be 75p as each plank is 250cm long and it costs £3.oo per meter length, so cost of one plank will be £3.00/4 ( as 250cm is 1/4 of 1 meter)

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 Post subject: Re: Mental arithmetic book 6 - schofileds&simsPosted: Mon Sep 20, 2010 7:47 pm

Joined: Fri Nov 17, 2006 8:54 pm
Posts: 1775
Location: caversham
WorriedRuby wrote:
Hi DIY mum,

re answer for the first question - we think it should be 75p as each plank is 250cm long and it costs £3.oo per meter length, so cost of one plank will be £3.00/4 ( as 250cm is 1/4 of 1 meter)

250cm is 2.5M, 25cm would be a quarter metre.

100cm=1M 10mm=1cm so 1000mm=1M, easy to get confused.

I have had fun trying to give DCs an appreciation of imperial units, they just don't get it!

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 Post subject: Re: Mental arithmetic book 6 - schofileds&simsPosted: Mon Sep 20, 2010 8:26 pm

Joined: Tue Mar 02, 2010 8:20 pm
Posts: 115
Hi stevew61 and DIY mum,

YES! you are both right! still don't believe we made such a silly mistake ( ))

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 Post subject: Re: Mental arithmetic book 6 - schofileds&simsPosted: Tue Sep 21, 2010 6:55 pm

Joined: Wed Apr 25, 2007 9:08 pm
Posts: 720
Location: Not in a hole in the ground but in a land where once they dwelt-the Beormingas
Don't worry about silly mistakes...I just made one today with my daughter.

The question was: if 2/3 of a number is 16 what is 3/4 of the number? Silly me was dividing by 3 instead of 16/2 to get 1/3 of the number: gives (8) which times by 3 reveals that the number is 24!! Thankfully, my daughter was awake and told me how to do it...I was so embarrassed!!

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 Post subject: Re: Mental arithmetic book 6 - schofileds&simsPosted: Sat Nov 09, 2013 6:15 pm

Joined: Sat Nov 09, 2013 6:13 pm
Posts: 7
can you tell me the answers to section 2 test 2 please my daughter very troubled thank you

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 Post subject: Re: Mental arithmetic book 6 - schofileds&simsPosted: Sat Nov 09, 2013 6:17 pm

Joined: Sat Nov 09, 2013 6:13 pm
Posts: 7
plz can you help my daughter she needs the answers for section 2 test 3

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