Proportions And Percent - Module 5

Front 1

proportion

Back 1

An equation that states that two ratios are equivalent. 2/3 = 4/6

Front 2

percent

Back 2

A ratio comparing a number to 100.

45% = 45/100

Front 3

percent of decrease

Back 3

A percent change describing a decrease in a

quantity. An item that costs $8 is marked down to $6. The amount of the decrease is $2, and the percent of

decrease is 2, 2/8 = 0.25 = 25%.

Front 4

percent of increase

Back 4

A percent change describing an increase in a

quantity. The price of an item increases from $8 to $12. The amount of the increase is $4, and the percent of

increase is 4/8 = 0.5 = 50%.

Front 5

principal

Back 5

The initial amount of money borrowed or saved.

Front 6

rate

Back 6

A ratio that compares two quantities measured in different units. The speed limit is 55 miles per hour, ratio or 55 mi/h.

Front 7

ratio

Back 7

A comparison of two quantities by division.

Front 8

simple interest

Back 8

A fixed percent of the principal. It is found using the

formula I = Prt, where P represents the principal, r the rate of interest, and t the time.

$100 is put into an account with a simple interest rate of 5%.

After 2 years, the account will have earned I = 100 ⋅ 0.05 ⋅ 2 = $10.

Front 9

unit rate

Back 9

A rate in which the second quantity in the comparison is one unit.

10 cm per minute

Front 10

expression

Back 10

A mathematical phrase containing variables, constants and

operation symbols. 6x + 1