Constant A value that does not change.

Ratio

A comparison of two quantities by division

Constant of proportionality

A constant ratio of two variables related proportionally

Complex fraction

A fraction that contains one or more fractions in the numerator. The denominator or both.

Conversion factor

A numerical factor used to multiply or divide a quantity when converting from one system of units to another.

Percent

A ratio comparing a number to 100

Rate

A ratio that compares two quantities measured in different units

Rate of change

A ratio that that compares

Proportional relationship

A relationship between two quantities in which the ratio of one quantity to the other quantity is constant

Proportion

An equation that states that two ratios are equivalent

Equivalent ratios

Ratios that name the same comparison

Unit rates

a comparison of two different quantities when they are combined together.