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 Post subject: dividing with decimalsPosted: Thu Mar 06, 2008 6:34 pm

Joined: Fri Jan 04, 2008 7:58 pm
Posts: 144
Can anyone please explain this to me

instruction: divide the following and round answer to 2 decimal places

question:- 65.35 / 1.3 answer = 0.129

any help greatly appreciated

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 Post subject: Posted: Thu Mar 06, 2008 7:05 pm

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 11952
Something wrong here as the answer you have given has 3dp!

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 Post subject: Posted: Thu Mar 06, 2008 8:04 pm

Joined: Fri Jan 04, 2008 7:58 pm
Posts: 144
sorry, looking at wrong answer the correct answer is 50.27 but the example in the book is not great and i'm still having trouble working out how to do these sums, so please help if you can.

many, many thanks

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 Post subject: Posted: Thu Mar 06, 2008 8:55 pm

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 11952
Usually I would encourage pupils to make sure the number they are dividing by is a whole number so:

65.35 / 1.3 = 653.5 / 13

which will give the same answer - first estimate 650 /10 is roughly 65

What method are you trying to use 'chunking' or 'short division' (Bus stop)

653.5 13 x 50 = 650

653.5 - 650 = 3.5 this is chunking as I'm taking 'chunks off'

3.5 /13 13 x 0.2 = 2.6

3.5 - 2.6 = 0.9

0.9/ 13 13 x 0.06 = 0.78 13 x 0.07 = 0.91 which is nearer

so answer is 50.27 (to 2 dp)

If it's short division you need to look at:

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 Post subject: Posted: Thu Mar 06, 2008 9:06 pm

Joined: Fri Jan 04, 2008 7:58 pm
Posts: 144
thank you so much, we were only making the 1.3 into whole number and not moving decimal for 65.35 also thanks for the link.

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 Post subject: Posted: Thu Mar 06, 2008 9:18 pm

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 11952
It's better to talk about multiplying both numbers by ten -

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 Post subject: Posted: Fri Mar 07, 2008 12:29 pm

Joined: Fri Jan 04, 2008 7:58 pm
Posts: 144
how do you mean?

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 Post subject: Posted: Fri Mar 07, 2008 5:26 pm

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 11952
It is not recommended to talk about moving decimal points - if you multiply both numbers by 10 you get whole numbers.

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 Post subject: Posted: Fri Mar 07, 2008 5:42 pm

Joined: Fri Jan 04, 2008 7:58 pm
Posts: 144
I see,

thank you it's much appreciated

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 Post subject: Posted: Fri Mar 14, 2008 11:43 am

Joined: Thu Mar 13, 2008 8:25 am
Posts: 102
65.35/1.3 - multiply until divisor is a whole number i.e. 13

653.5/13 and then do a short division.

If the sum was 23.6/0.14 you would need to multiply the whole thng by 100 so that you were dividing by 14:

2360/14

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