Proportions

Proportions

​Setting it up...

​You can use a table or chart for proportion problems. It is helpful to highlight the different types of numbers with different colors. As, you can see on the right, there are many different correct ways to set up a table or chart. This is just four correct ways of setting it up.

​You can use tables or proportions.

​Here are the same 4 examples written as proportions instead of in a table.

​With so many different ways to set up the problem, how do we know if we have set it up correctly?

​You need to check two things.

​First...

​The same types of numbers should be together. In our examples all of the numbers for miles are green and all of the numbers for hours are orange. You can see that the green numbers are always beside each other or above/below each other. The orange numbers are always together too

Multiple Choice

​Second...

​You need to make sure that the numbers that are in the same sentence are together. In our example it says Harry walked 20 miles in 5 hours. So, 20 and 5 should be beside each other or above/below each other.

Multiple Choice

Multiple Choice

Choose the correct proportion for the following problem:

Shania uses 12 sheets of  

paper for every pencil.  If she uses 3 pencils, how many sheets of paper will she use?

Multiple Choice

Choose the correct proportion for the following problem:

Jason keeps 12 pieces of gum for every 3 bags of Takis in his backpack.  If Jason has 4 pieces of gum, how many bags of Takis does he have?

Multiple Choice

Choose the correct proportion for the following problem:

Vanessa completes one homework assignment every 12 minutes.  If Vanessa has 9 homework assignments, how long will her homework take?

Multiple Choice

Choose the correct proportion for the following problem:

There are 4 volunteers bathing every 12 dogs at the animal shelter. If there are 9 volunteers, how many dogs can they bathe?