A ratio compares two or more quantities, showing how much of one thing there is compared to another

There are 4 red balls and 6 blue balls. Write the ratio of red to blue in its simplest form.

If the ratio is 2:5, and the first part is 8, what is the second part?

Complete the equivalent ratio: 3:7 = 12:?

Complete the equivalent ratio: ?:15 = 4:5

Share £20 in the ratio 1:3. How much is the larger share?

Share 45 sweets between Ali and Ben in the ratio 2:7. How many does Ben get?

Three friends share £60 in the ratio 1:2:3. What is the largest share?

Ann and Bob share money in the ratio 3:5. Bob gets £40. How much does Ann get?

A recipe uses flour and sugar in the ratio 5:2. If you use 250g of flour, how much sugar do you need?

The ratio of boys to girls in a class is 3:4. There are 12 boys. How many students are there in total?

Orange squash is mixed with water in the ratio 1:4. How much water is needed for 50ml of squash?

When two quantities increase or decrease at the same rate

If 3 pencils cost 45p, how much do 5 pencils cost?

If 4 books weigh 600g, how much do 7 books weigh?

A car travels 120 miles in 2 hours. At the same speed, how far will it travel in 5 hours?

A recipe for 4 people uses 200g of pasta. How much pasta is needed for 6 people?

A cake recipe for 8 uses 240g of flour. How much flour for 12 people?

If 2/5 of a class are boys, what is the ratio of boys to girls?

The ratio of cats to dogs is 3:7. What fraction of the pets are cats?

Tom and Jerry share marbles in the ratio 4:5. If Jerry has 15 more marbles than Tom, how many marbles are there in total?

A map has a scale of 1:50000. Two towns are 8cm apart on the map. What is the real distance in kilometres?

The ratio of ages of Amy and Ben is 2:3. In 6 years, their ages will be in ratio 3:4. How old is Amy now?

Master ratio notation, simplifying, sharing quantities, and proportion problems