Idea 5of 23Builds onThe price for 100 g
The price for one litre
How do you find a unit price for a drink?
Today you'll discover
- how many litres a container holds
- how to share the price
- Ontario milk bags
Think first2 L of apple juice for $3.80
A 2 L bottle of apple juice costs $3.80. What is the price for 1 L?
Decide first, then press Next. Count how many litres the container holds.
A 2 L bottle of apple juice with a tag: $3.80. Then a bar cut into 2 equal parts of 1 L, then $3.80 ÷ 2 = $1.90 per litre in each part and on the tag, then the check 2 × $1.90 = $3.80. The last step asks about a 4 L bag of milk for $6.20.
See the whole ideathe big idea and the key word, in one place
The big idea
Divide the price by the number of litres to get the price per litre.
Milk in OntarioIn Ontario, milk often comes in 4 L bags of three pouches. Work out the price per litre from all 4 litres.
Easy to get wrongHalving twice is the same as dividing by 4: $6.20, then $3.10, then $1.55.
Key word
- per litre
- for every litre: $1.90 per litre means each litre costs $1.90
Ready to use it?
- Find a price per litre.
- Divide by 4 by halving twice.