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 Post subject: mental maths and numberlinesPosted: Fri Oct 28, 2011 1:34 pm

Joined: Mon Mar 08, 2010 1:03 pm
Posts: 1413
Hello,

Can someone tell me if, when adding, say, 56+38, it is best to learn to do lots of this sort of question with number lines first, so that you can mentally picture the numberline at some point and do these sums mentally? My year 3 DS seems to be imagining the numberline in this way: 56 + 30 and getting to 86 quickly but then has to practically count on his fingers to add the remaining units, instead of being able to mentally bridge the 10 on a numberline and so on.

Hope that made sense . I just wondered if doing lots of these sums with a numberline would help him to finally get it mentally, or whether there was a more efficient method.

Thank you!

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 Post subject: Re: mental maths and numberlinesPosted: Fri Oct 28, 2011 1:37 pm

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 11954
Yes - number lines are a good support -

I'd encourage him to tackle 56 + 38 by one of

* 56 + 30 = 86 then + 4 to get 90 then add the remaining 4 (this avoids bridging the ten)

* adding on 40 and subtracting 2 - it's quicker!

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 Post subject: Re: mental maths and numberlinesPosted: Fri Oct 28, 2011 2:03 pm

Joined: Mon Mar 08, 2010 1:03 pm
Posts: 1413
Thanks so much Guest55. I thought adding units to the nearest 10, in this case 90 and then adding on til you've added all the remaining units, was called 'bridging through 10'!

and, yes, I can see that adding 40 and subtracting 2 is far better - much quicker. Thank you!

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 Post subject: Re: mental maths and numberlinesPosted: Fri Oct 28, 2011 2:12 pm

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 11954
You can call it bridging through 10 ...

http://ictgames.com/bridgingThro.htm has some games about it ...

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 Post subject: Re: mental maths and numberlinesPosted: Fri Oct 28, 2011 2:39 pm

Joined: Mon Mar 08, 2010 1:03 pm
Posts: 1413
They look great games. Thank you very much!

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 Post subject: Re: mental maths and numberlinesPosted: Fri Oct 28, 2011 4:00 pm

Joined: Mon Jun 18, 2007 2:32 pm
Posts: 6966
Location: East Kent
Guest55 wrote:
You can call it bridging through 10 ...

http://ictgames.com/bridgingThro.htm has some games about it ...

I've used the catapult one with y5/y6 children who found it hard to visualise and it was very useful

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 Post subject: Re: mental maths and numberlinesPosted: Fri Oct 28, 2011 4:26 pm

Joined: Mon Mar 08, 2010 1:03 pm
Posts: 1413
Thanks for the pointer, Yoyo

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