Introducing Ratios Unit 2 Review

Front

What is a ratio?

Back

A ratio is a comparison of two quantities that shows the relative size of one quantity to another, often expressed as 'a:b'.

Front

How do you calculate the time taken to read a certain number of pages if you know the time taken for a different number of pages?

Back

To find the time taken to read a different number of pages, use the formula: (Time per page) = (Total time) / (Number of pages). Then multiply the time per page by the new number of pages.

Front

If Kiran reads 5 pages in 20 minutes, how long does it take him to read 1 page?

Back

It takes Kiran 4 minutes to read 1 page (20 minutes / 5 pages = 4 minutes per page).

Front

What is the total number of animals if the ratio of cats to dogs is 4:5?

Back

The total number of animals can be found by adding the parts of the ratio: 4 + 5 = 9 parts. If there are 27 animals, each part represents 3 animals (27 animals / 9 parts = 3 animals per part).

Front

How do you find the value of each part in a ratio when given the total quantity?

Back

Divide the total quantity by the sum of the parts in the ratio to find the value of each part.

Front

What is the cost per pound if 3 pounds of peanuts cost $7.50?

Back

The cost per pound is $2.50 ($7.50 / 3 pounds = $2.50 per pound).

Front

How do you set up a double number line to represent a ratio?

Back

Draw two parallel lines, label one for the first quantity and the other for the second quantity, and mark equal intervals that correspond to the ratio.

Front

If you need to make purple paint using red and blue paint in a ratio of 3:2, how much blue paint is needed for 12 cups of red paint?

Back

You would need 8 cups of blue paint (if 3 cups of red require 2 cups of blue, then 12 cups of red require 8 cups of blue).

Front

What is the formula to find the total number of items based on a ratio?

Back

Total items = (Sum of ratio parts) x (Value of each part).

Front

If the ratio of cats to dogs is 4:5 and there are 27 animals, how many cats are there?

Back

There are 12 cats (4 parts of the ratio x 3 animals per part = 12 cats).