R
A comparison of two numbers with division.
Ratio
a comparison of two numbers with 2 different units.
Rate
A rate with a denominator of one.
Unit Rate
An equation that states 2 ratios are equal.
Proportions
Multiplying the numerator and denominator by the same factor
Scaling Up
Dividing the numerator and denominator by the same fator.
Scaling Down
When a proportion is written with colons, the first and last number.
Means
When a proportion is written with colons, the second and third number.
Extremes
States that in a proportion, the product of the first and last number is equal to the product of the second and third number
Means-Extreme Method
X and Y both increase at a constant rate that begins at the origin
Direct Variation
"K" Representsthe unit rate or the constant rate in a direct variation
Constant of Proportionality
Data that can be represented by whole numbers only.
Discrete Data
Data that can be represented by numbers between whole numbers. (i.ie. fractions and decimals.)
Continuous Data
The point where the X-axis and Y-axis intersect on the coordinate plane; (0,0)
Origin
Two variables change in inverse proportions
Indirect Variation
A relationship between two quantities in which the ratio of the quantity to the other quantity is constant
Proportional Relationship
A fraction that contains one or more fractions in the numerator, the denominator, or both.
Complex Fraction
A ratio that compares the amount of changes in a dependent variable to the amount of change in an independent variable.
Rate of Change
Changing one unit to a different, equivalent unit
Convert
Percent x Whole = Part
Percent Equation
Part to whole = percent over 100
How do you go from a percent to a decimal.
divide the percent by 100
3 ways to write a ratio
Fraction, Colon, and To
3 ways you know something is proportional or not
k is the same
graph a straight line
goes through the origin (0,0)
Bonus: How many days of school are left?
51 days