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7th Grade Unit 3, Lesson 1
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Terms in this set (19)
Ratio
A comparison of two or more quantities; may be written as 3:4 or as a fraction.
Proportion
An equation stating that two ratios are equivalent.
Unit Rate
A ratio that compares quantities of two different types and the quantity of the second number is "1"; a rate that has a denominator of "1" unit.
Constant of Proportionality
The constant value of the ratio of two proportional quantities "x" and "y"; usually written y=kx, where "k" is the constant value.
Sales Tax
A tax on sales or on the receipt from sales.
Proportional
A part to whole comparison; the equality of two ratios, written as an equation.
Discount
To reduce in price, quantity or value.
Scale Factor
A ratio between two sets of measurements; a ratio expressing the amount of magnification.
Percent
A number out of one hundred.
Proportional Relationship
A relationship between two measurements in which one is a constant multiple of the other.
Input
The number you put into an expression/equation.
Expression
One or a group of mathematical symbols representing a number or quantity; may include numbers, variables, constants, operators and grouping symbols.
Equation
Mathematical statement containing an equal sign to show that two expressions are equal.
Output
The answer you get after solving an equation.
Equivalent Ratios
A fraction that is equal to another fraction.
Fractions
Any part of a group, number or whole; similar to a decimal.
Decimal
A number system based on 10; a special kind of fraction.
Equivalent
Having the same value or amount; commensurate.
Unit Rate
A ratio that compares quantities of two different types and the quantity of the second number is "1"; a rate that has a denominator of "1" unit.
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