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Vocabulary for Chapter 7
McDougal Littell Course 3
26
Mathematics
6th Grade
04/19/2009

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Term
ratio
Definition
the comparison of two numbers using division
(usually a fraction but also "to" or : )
Term
equivalent ratios
Definition
two or more ratios that have the same value (8:5 and 16:10 for example)
Term
rate
Definition
a ratio of two quantities that have different units (for example, 10 laps/5 min.)
Term
unit rate
Definition
a rate that has a denominator of 1 unit (for example, 50 jumps/1 min.)
Term
proportion
Definition
two ratios set equal to each other (fraction = fraction)
Term
cross products
Definition
the two products found by multiplying the top of one ratio in a proportion and the bottom of the other
Term
scale model
Definition
a model of an actual object that is either bigger or smaller but made proportionately
Term
scale
Definition
the relationship between the dimensions of a model and the dimensions of the actual object
Term
percent
Definition
a ratio (or fraction) whose denominator is 100
Term
percent of change
Definition
reflects as a percent how much a quantity has increased or decreased from the original amount
Term
percent of increase
Definition
reflects as a percent how much a quantity has been increased from the original amount
Term
percent of decrease
Definition
reflects as a percent how much a quantity has been decreased from the original amount
Term
wholesale price
Definition
the price that a store pays the manufacturer for items
Term
markup
Definition
the increase in the wholesale price of an item
Term
discount
Definition
a decrease in the retail price of an item
Term
retail price
Definition
the price that a store charges its customers for an item
Term
retail price = wholesale price + markup
Definition
the relationship between wholesale price, markup and retail price
Term
sale price = original price - discount
Definition
the relationship between discount, original price and sale price
Term
interest
Definition
an amount paid for the use of money
Term
principal
Definition
the amount of money you borrow or deposit
Term
simple interest
Definition
interest that is paid only on the principal
Term
annual interest rate
Definition
the percent of the principal that you pay or earn per year
Term
I = prt
Definition
Simple Interest Formula
Term
probability of an event
Definition
the likelihood that an event will occur
Term
P = winners/total
Definition
(theoretical) probability formula
Term
experimental probability
Definition
probability based on what has already happened and been observed
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