Ratios are usually written in the form a:b and can be used on maps to show the scale in relation to real life. Two quantities are in direct proportion when they increase or decrease in the same ratio.

Which ratio is equivalent to ?

Which ratio is not equivalent to ?

What is in its simplest form?

Alex and Sara share in the ratio . How much does Sara get?

Alex and Sara share in the ratio . How much does Alex get?

A drink is made by pouring one part of squash to four parts of water. If there is a total of , how much of it is squash?

A room plan is made on a scale of . If the length of the room on the plan is , what is its actual length?

If a map is on a scale of , what distance on the map represents ?

On a school trip, adults are required to supervise a group of children. How many adults will be required for children?

If the price of five CDs is , how much will seven CDs cost?