Divide decimal numbers with whole numbers

[haniya11plus]

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

[hermanmunster]

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

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

[ToadMum]

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.

[haniya11plus]

Sorry £1.80 / ?
Then multiply?

[kenyancowgirl]

£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.

[ToadMum]

£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 .

[haniya11plus]

Thanks ladies
X
Was having nightmares with these mental arithmetic questions with year 5 child

[Guest55]

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

[haniya11plus]

Its in Mental Arithmetic book 4
Prep for 11+ exams

[Guest55]

Sorry - may I suggest you stop using this book? It really is not appropriate and 5 years old is too young anyway.