Decorating a room
Harry is changing his room colours.
Colour 
5 ltr 
2.5 ltr 
1 ltr 

Work out the cheapest 




ltr of
paint 





Average cost per litre 





What would it cost for 




rooms the same size 

How to solve the decorating problem Find the row in the table that contains the information you will need,.
The next sized tin down is 2.5 litres, as Harry still needs 4.5 litres of paint, you can see he will
need one 2.5 tin of paint which then leaves him with 2 more litres fo buy, so the total amount of tins he needs to get the cheapest price is 2 x 5ltr tins, 1 x 2.5ltr tin and 2 x 1ltr tins, your final calculation should look something like this one below . (2 x £21.00) + (1 x £12.00) + (2 x £6.00) to keep things tidy try putting brackets around each section of the initial calculation (BODMAS), this will help to stop confusion when doing the calculations. At this point 14.5 does not go into 8 so you now need to put in a decimal point and a place holding 0, so that you can carry out the the next step of the calculation as shown below. The complete calculation should look like this So you now have digit values for the whole, tenths and hundredths columns, which is what you need to give your answer in pounds and pence (to 2 d.p). So you add up all the values of the place columns to get an answer of £4.55 per ltr.
Practice answering some more questions using your calculator. Buy Collins Primary Maths Books here!
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