Ratios
Unit Rate
Tables .. Proportional?
Graphs .. Proportional?
What's Waldo?
100
Your grandma can bake 3 dozen cookies with 2 cups of sugar.
The ratio for cookies to cups is 3:2
What is the y value of the ratio? What is the x value?
y value: cookies (3)
x value: cups (2)
100
How do you calculate the unit rate of a ratio of
y:x ?
Divide y by x
100
Is the following table proportional for the ratios y:x? Why or why not?
**What unit rate(s) did you come up with? 
The table is proportional.
The unit rate is 0.33333333
100
How can you tell if a graph is proportional just by looking at it?
* It must be a straight line
* It must pass through the origin (0,0)
100
What is the equation for solving for a missing value in a ratio?
y=(k)x
200
Justin knows that in 2 hours, he can drive 75 miles.
Write the ratio of miles to hours.
miles : hours
75 : 2
200
Which table represents the unit rate of 5?
The table on the right has the unit rate of 5.
200
Is the following table proportional? Why or why not?
**What unit rate(s) did you come up with?
The table is nonproportional.
12:3 .... 4
7/2 .... 3.5
14:2 .... 7
16:4 .... 4
200
Is the following graph proportional?
Why or why not?
The graph is nonproportional.
Even though is passes through the origin, it is NOT a straight line.
200
If I get paid $10.50 for 1 hour of work (10.50:1), how much money would I make if I worked for 3 hours?
Use the equation y=(k)x to help you.
I get paid $31.50 for 3 hours of work.
31.50 : 3 ..... dollars : hour
300
Which of the following ratios are equal to each other in the table? 
3/4 and 0.75 : 1
300
Is the following table proportional for
pages to hours?
How many pages can Lucas read in 1 hour?
The table is proportional.
Lucas can read 26 pages in 1 hour. (26:1)
The unit rate is 26.
300
Based on the graph, how many bicycles are produced in 10 days?
50 bicycles are produced in 10 days.
300
In a proportional table, you are given the ratio 15:12, or 15 to 12.
Use the equation y=(k)x to solve for y in the ratio
y to 5
y=6.25
6.25 : 5
400
What does the point (0,0) represent in the following graph?
0 bicycles are produced in 0 days.
In 0 days, 0 bicycles are produced.
400
Trisha uses 3 cups of sugar to every 2 teaspoons of baking powder to make a batch of brownies.
If Trisha uses 9 cups of sugar, how many teaspoons of baking powder does she need for her brownies?
Trisha will need 6 teaspoons of baking powder.
500
The point (4,6) is on the graph of a proportional relationship. Which of the following points is also on the same line on the graph?
(0,6) (6,4)
(4,0) (0,0)
(0,0)
NOT answer: (0,6) (6,4) (4,0)
