In this activity, we are using the unitary method to work out proportion problems.
You will need a calculator for this.
If a chocolate bar is 80p for 1, then we would expect to multiply 80p by the number of bars we want to buy.
If we want 3 bars then 3 x 80p = £2.40
We call this direct proportion - as one value rises so does the other!
Likewise in reverse, if we only have the price for a number of items we can divide by that number to find the price of one!
A pack of 5 highlighters costs £3.50
What is the cost of one?
We divide by 5 here!
3.50 ÷ 5 = £0.70 each.
We could then work out the price for any number of highlighters from there by multiplying by £0.70!
Let's try some of these!