chapter 6 pre-algebra glossary words

Question 1

proportional

Answer 1

2 quantities are ___________if they have a constant ratio or rate

Question 2

rate

Answer 2

is a ratio of 2 quantities having different kinds of units

ex. miles in hours

Question 3

ratio

Answer 3

a comparison of 2 quantities by division

ex. 2:4 or 2/4

Question 4

scale

Answer 4

determined by the ratio of a given length on the drawing or model to its corresponding length on the actual object

Question 5

scale drawing or scale model

Answer 5

used to represent an object that is too large or too small to be drawn or built at actual size

Question 6

scale factor

Answer 6

when the scale is written in simplest form it is called the ______________.

Question 7

simple interest

Answer 7

amount of money paid or earned for the use of money

Question 8

simple interest formula

Answer 8

I=prt

Interest = principal x annual interest rate (decimal) x time (in years)

Question 9

unit rate

Answer 9

when a rate is simplified so that it has a demoninator of 1

example of unit rate = $5 per pound

Question 10

cross products

Answer 10

the products of ad and cb are called ______of this proportion
cross products of any proportion are equal

Question 11

discount

Answer 11

amount by which the regular price is reduced

Question 12

nonproportional

Answer 12

relationships in which the ratios or rates are not constant

Question 13

percent

Answer 13

is a ratio that compares a number to 100

Question 14

percent equation p.332

Answer 14

is an equivalent form of a percent proportion in which the percent is written as a decimal

Question 15

percent of change p. 338

Answer 15

tells the percent an amount has increased or decreased in relation to the original amount

Question 16

percent of decrease

Answer 16

when the amount decreases, the percent of change is negative

Question 17

percent of increase

Answer 17

when an amount increases, the percent of change is