Embed Size (px)
Citation preview
POP QUIZ
Write these ratios in all three ways (in simplest form).1. What is the ratio of stars to arrows?2. What is the ratio of arrows to checkmarks?
Find the unit rate.3. 650 miles in 24 hours4. $8.96 for 4 boxes of paper
Which one would be the better buy? Show the unit price for each item in your work, circle the better buy.5. $3.50 for 10 apples or $4.00 for 14 apples
A ratio is a way of comparing amounts.
The ratio of pizza to hamburgers is 5:7.
The ratio of hamburgers to pizza is 7:5.
A group of students had a choice of either hamburgers or pizza for lunch. There were 12 students. 5 chose pizza and 7 chose hamburgers for lunch.
A group of students had a choice of either hamburgers or pizza for lunch. There were 12 students. 5 chose pizza and 7 chose hamburgers for lunch.
When two quantities increase and decrease in the same ratio, they are in direct proportion.
When mixing paint, the ratio of red to white paint is 4:1.
+
When two quantities increase and decrease in the same ratio, they are in direct proportion.
This is the amount of paint needed to paint two sides of the shed. How much of each color would we need if we wanted to paint all four sides of the shed?
+
+
If we double the amount of red paint, we have 8 cans.
If we double the amount of white paint, we have 2 cans.
To paint the whole shed, we would have to double the amount of red paint. When we double the amount of red paint, we must increase the amount of white paint in the same ratio.
16 red cans4 white cans16:4
+
How much paint would you need to paint two sheds, using the information on the previous page? Move the shed to reveal the answer.
How much paint would you need to paint two sheds, using the information on the previous page? Move the shed to reveal the answer.
1:2 = 2:3
Click herefor the
answer
Click herefor the
answer
Ratios in direct proportion
1:4 = 4:1
4:2 = 12:6 3:1 = 9:35:10 = 1:2
1:6 = 2:12
Drag the ratios into the box that are in direct proportion.Drag the ratios into the box that are in direct proportion.
A factory makes 5 bicycles per hour. How many bicycles can they make in 2 hours?
Click herefor the
answer
Click herefor the
answer
Use direct proportion to answer the following questions.
One chocolate bar costs 1 dollar. How much would 5 bars cost?
A taxi goes 10 miles in 20 minutes. How far does it travel in one hour?
Use direct proportion to answer the following questions.
Sue can do 20 math questions in 5 minutes.How many can she do in 1 minute?
Click herefor the
answer
Click herefor the
answer
Use direct proportion to answer the following questions.
Four packs of candies cost $4.50.How much would 2 packs cost?
The city bus goes 18 miles in 30 minutes.How far does it go in 10 minutes?
Use direct proportion to answer the following questions.
Press the link below for more practice.Press the link below for more practice.
The following pages are answers to the tasks in the lesson activity.The following pages are answers to the tasks in the lesson activity.
1:2 = 2:3
Ratios in direct proportion
1:4 = 4:1
4:2 = 12:63:1 = 9:35:10 = 1:2 1:6 = 2:12
Click here
to go back
Click here
to go back
A factory makes 5 bicycles per hour. How many bicycles can they make in 2 hours?
One chocolate bar costs 1 dollar. How much would 5 bars cost?
A taxi goes 10 miles in 20 minutes. How far does it travel in one hour?
10 bicycles
$5
30 miles
Click here
to go back
Click here
to go back
4 questions
$2.25
6 miles
Click here
to go back
Click here
to go back
Sue can do 20 math questions in 5 minutes.How many can she do in 1 minute?
Four packs of candies cost $4.50.How much would 2 packs cost?
The city bus goes 18 miles in 30 minutes.How far does it go in 10 minutes?
