Solving Problems with Ratios

A proportion is when....

• two ratios are set to be equal

• one ratio is bigger than the other

• the ratio cannot be solved

• we find the unit price

How can we identify the unknown in a proportion? (Check all the right answers)

• using a variable, like x or y

• putting a box in the place of the unknown

• putting a question mark in place of the unknown

• putting the number 10 to hold the place

Solve the proportion: If there are 10 students in one class, there would be _________ students in 5 classes.

• 5

• 50

• 10

• 55

Solve the proportion, a car that drives 100km / hour, will travel _________ km in 3 hours.

• 3

• 100

• 150

• 300

Once a proportion is set up, the first step is to.....
(Here is an example: \frac{x}{4}=rac{12}{24})

• multiply on the diagonal

• multiply the numbers in the second fraction

• divide each number, one by one

• add on the diagonal

What is a real life example of using proportions?

• Figuring out how much laundry soap to put in the machine

• Figuring out how much medicine a small child should take

• Calculating your hourly pay on a job

• Finding the percent discount on a pair of shoes that were on sale

• A

• B

• C

• D

• A

• B

• C

• D

• A

• B

• C

• D

• A

• B

• C

• D