7 terms

proportion

an equation stating that two ratios are equivalent, or equal.

similar

figures that are the same shape but not necessarily the same size

percent change

the amount stated as a percent that a number increases or decreases

percent increase

a percent change describing an increase in a quantity

percent decrease

a percent change describing a decrease in a quantity

tax/gratuity

a certain percent of the amount paid

percent error

a certain percent of the amount paid