Percentages
What is 50% as a decimal?
0.5 or 0.50
If I have 5 red balloons and 3 blue balloons, what is the ratio of red balloons to blue balloons?
"5:3" or "5 to 3"
In a table that represents a proportional relationship, which side do the inputs go on AND which side do the outputs go on.
Inputs go on the left and outputs go on the right.
P.C. = 4
Inputs: 10
Outputs: 40
P.C. = 2
Outputs: 20
Inputs: 10
What is 0.75 as a percent? (Think about what the opposite of division is)
75%
If Mr. Miller knows 7 male friends and 4 female friends, then what is the ratio of female friends to male friends?
"4:7" or "4 to 7"
Remember that order matters!
Daily Double:
What is the definition of the word "constant"
"Unchanging" or "It doesn't change" or "It stays the same"
P.C. = 20
Inputs = 3, 5
Outputs: 60, 100
P.C. = 5
Outputs: 30, 40
Inputs: 6, 8
In the word "percent" what does "cent" mean?
(Hint: think about pennies)
"one hundred"
I have 2 sausages and 4 hams. What is the ratio of sausages to hams?
"2:4" or "2 to 4"
In a proportional relationship, what is the equation you use to get the output?
"output = P.C. x input" or "P.C. x input = output"
P.C. = 11
Inputs: 3, 6, 9
Outputs: 33, 66, 99
P.C. = 7
Outputs: 21, 35, 56
In the word "percent" what does "per" mean?
(Hint: Think of miles per hour)
"To divide" or "to divide by"
If I have 17 dogs, 13 cats, and 14 birds what is the ratio of cats to birds to dogs?
"13:14:17" or "13 to 14 to 17"
There needs to be a proportionality constant (P.C.) or the number you multiply the inputs by must all be the same.
P.C. = 15
Inputs: 2, 5, 6, 10
Outputs: 30, 75, 90, 150
P.C. = 9
Outputs: 18, 45, 63, 72
Inputs: 2, 5, 7, 8
What is 50% of 30?
15
What is the Most Reduced Form of the ratio "4:12"?
"1:3"
Notice that we divided each number by the common factor of 4 to get this!
(Hint: Does vt=d sound familar?)
P.C. = 0.5
Inputs: 10, 20, 30, 40, 50
Outputs: 5, 10, 15, 20, 25
P.C. = 0.5
Outputs: 10, 20, 30, 40, 50
Inputs: 20, 40, 60, 80, 100