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 Post subject: More exercise, help pleasePosted: Sat Feb 16, 2013 5:35 pm

Joined: Sun Jan 20, 2013 10:22 am
Posts: 73
https://www.dropbox.com/s/agymm3y2uy02o ... 5%2010.jpg

Answer doesn't seem to match to my little brain.

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 Post subject: Re: More exercise, help pleasePosted: Sat Feb 16, 2013 5:46 pm

Joined: Mon Aug 22, 2011 8:20 pm
Posts: 1706
Location: Warwickshire

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 Post subject: Re: More exercise, help pleasePosted: Sat Feb 16, 2013 5:50 pm

Joined: Sun Jan 20, 2013 10:22 am
Posts: 73
Thanks, how it works.

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 Post subject: Re: More exercise, help pleasePosted: Sat Feb 16, 2013 5:55 pm

Joined: Sat Mar 06, 2010 11:39 pm
Posts: 2080
DS said that substitution works. He used N=4 and only one of those responses worked.

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 Post subject: Re: More exercise, help pleasePosted: Sat Feb 16, 2013 6:02 pm

Joined: Mon Mar 12, 2007 11:49 am
Posts: 450
You have to do this step by step.

N is first divided by 4. That gives you N/4.

Then you add 1. That gives you N/4 + 1.

Then you have to multiply the whole lot by 2. That gives you 2 x (N/4 +1), which is 2N/4 + 2, which is N/2 + 2.

Think of it this way - 1/4 x 2 is 2/4, which is 1/2.

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 Post subject: Re: More exercise, help pleasePosted: Sat Feb 16, 2013 7:06 pm

Joined: Sun Jan 20, 2013 10:22 am
Posts: 73
Sometimes starts from left to right regardless of add or multiply but sometimes it is in hierarchal order. Which one we can teach. At least brackets will not confuse them at this stage.

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 Post subject: Re: More exercise, help pleasePosted: Sun Mar 03, 2013 10:46 pm

Joined: Tue Jul 21, 2009 9:56 pm
Posts: 8228
Eh? Think it follows BODMAS always. What did you mean by "which to teach?"

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