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 Post subject: MathsPosted: Wed Oct 07, 2009 6:21 pm

Joined: Fri Aug 22, 2008 11:08 am
Posts: 91
I am struggling to guide my daughter with this question:

If 12 is subtracted from 1/10 of a certain number and the answer is 13 what is the number?

Can anybody help?

Thanks

Polly

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 Post subject: Re: MathsPosted: Wed Oct 07, 2009 6:37 pm

Joined: Fri Nov 17, 2006 8:54 pm
Posts: 1770
Location: caversham
polly0494 wrote:
I am struggling to guide my daughter with this question:

If 12 is subtracted from 1/10 of a certain number and the answer is 13 what is the number?

Can anybody help?

Thanks

Polly

Hi,

Try drawing a function machine or a sum with an empty box.

The trick is to work from back to front, in this case.

So, 13 equals (a number divided by ten) minus 12.

So 13=25-12, so 13=250/10-12. So 250?

Did I get the right answer?

Where is G55 when you need some maths help.

steve

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 Post subject: Posted: Wed Oct 07, 2009 6:38 pm

Joined: Thu Jan 15, 2009 3:22 pm
Posts: 90
You need to reverse the proceedure - 12 +13 = 25

25 is 1/10 of the number thus the number must be 250.

hope this helps

Emma

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 Post subject: Posted: Wed Oct 07, 2009 6:41 pm

Joined: Fri Aug 22, 2008 11:08 am
Posts: 91
Thanks for the quick replies!

It's been a bad day at the office and I could not explain it!

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 Post subject: Re: MathsPosted: Wed Oct 07, 2009 7:08 pm

Joined: Sat Nov 24, 2007 11:09 pm
Posts: 218
polly0494 wrote:
I am struggling to guide my daughter with this question:

If 12 is subtracted from 1/10 of a certain number and the answer is 13 what is the number?

Can anybody help?

Thanks

Polly

There is another approach

We do not know what the number is, so make it as X

(1/10 of X) -12 = 13

(1/10 of X) = 25

Therefore X = 250

Hope this helps

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 Post subject: Posted: Thu Oct 08, 2009 7:49 am

Joined: Fri Aug 22, 2008 11:08 am
Posts: 91

Ny daughter and I have worked through it using the suggested methodologies and seems to get it! I am going to write a few more like this for her later and see if she can work them out!

Thanks again,

Polly

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