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 Post subject: Divide decimal numbers with whole numbersPosted: Tue Oct 30, 2018 7:54 am

Joined: Tue Oct 09, 2018 12:36 pm
Posts: 56
How to divide decimal number by big whole number
For example

Mince cost £1.80 per 1/2kg
Find the cost of mince weighing 600g?

I am using 1.80/500x600 method on calculator but how to do on paper

Thanks

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 Post subject: Re: Divide decimal numbers with whole numbersPosted: Tue Oct 30, 2018 8:00 am

Joined: Fri Sep 15, 2006 8:51 am
Posts: 8992
haniya11plus wrote:
How to divide decimal number by big whole number
For example

Mince cost £1.80 per 1/2kg
Find the cost of mince weighing 600g?

I am using 1.80/500x600 method on calculator but how to do on paper

Thanks

1) double it for a whole Kg
2) divide by 10 for cost for 100g
3) times by 6.

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 Post subject: Re: Divide decimal numbers with whole numbersPosted: Tue Oct 30, 2018 8:07 am

Joined: Wed Jan 18, 2012 11:41 am
Posts: 8244
Location: Essex
haniya11plus wrote:
How to divide decimal number by big whole number
For example

Mince cost £1.80 per 1/2kg
Find the cost of mince weighing 600g?

I am using 1.80/500x600 method on calculator but how to do on paper

Thanks

1/2Kg = 500g = £1.80

500g = 5 x 100g

You want the cost of 600g

600g = 6 x 100g

Divide the £1.80 by the number of units of 100g it represents, then multiply this by the number of units of 100g you want to price up ...?

No need for all those 00s.

_________________
Outside of a dog, a book is a man's best friend. Inside of a dog it's too dark to read.Groucho Marx

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 Post subject: Re: Divide decimal numbers with whole numbersPosted: Tue Oct 30, 2018 8:40 am

Joined: Tue Oct 09, 2018 12:36 pm
Posts: 56
Sorry £1.80 / ?
Then multiply?

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 Post subject: Re: Divide decimal numbers with whole numbersPosted: Tue Oct 30, 2018 8:55 am

Joined: Mon Oct 21, 2013 7:59 pm
Posts: 5116
£1.80 divided by 5 (as in the 500g that cost £1.80) would give you the cost for 100g

Times that 100g cost by 6 to get the cost of 600g.

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 Post subject: Re: Divide decimal numbers with whole numbersPosted: Tue Oct 30, 2018 8:59 am

Joined: Wed Jan 18, 2012 11:41 am
Posts: 8244
Location: Essex
kenyancowgirl wrote:
£1.80 divided by 5 (as in the 500g that cost £1.80) would give you the cost for 100g

Times that 100g cost by 6 to get the cost of 600g.

Thanks, KCG

I was trying to follow the 'give hints, rather than do the whole thing' rule, but obviously it doesn't always work .

_________________
Outside of a dog, a book is a man's best friend. Inside of a dog it's too dark to read.Groucho Marx

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 Post subject: Re: Divide decimal numbers with whole numbersPosted: Tue Oct 30, 2018 9:01 am

Joined: Tue Oct 09, 2018 12:36 pm
Posts: 56
X
Was having nightmares with these mental arithmetic questions with year 5 child

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 Post subject: Re: Divide decimal numbers with whole numbersPosted: Tue Oct 30, 2018 10:25 am

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 16026
Why is a 5 year old doing this question? It's inappropriate.

In any question it's a good idea to estimate - what sort of answer are we expecting? 600g is more tha half a kg so the answer should be bigger

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 Post subject: Re: Divide decimal numbers with whole numbersPosted: Tue Oct 30, 2018 10:27 am

Joined: Tue Oct 09, 2018 12:36 pm
Posts: 56
Its in Mental Arithmetic book 4
Prep for 11+ exams

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 Post subject: Re: Divide decimal numbers with whole numbersPosted: Tue Oct 30, 2018 10:32 am

Joined: Mon Feb 12, 2007 1:21 pm
Posts: 16026
Sorry - may I suggest you stop using this book? It really is not appropriate and 5 years old is too young anyway.

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