Solve Problems Using Direct Proportion

When we buy one of something we expect the price to go up 'proportionally' if we want to buy more.

For example 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!

We use this a lot when we are cooking or baking.

For example, if a recipe states 200 g of chicken for 4 people, we can work out how much will be needed for 1 person.

200 ÷ 4 = 50 g

Or we can work out how much for 8 people (double 4 people, so double 200 g)

200 x 2 = 400 g

Are you ready to try some questions now?