The percent the absolute error is of the actual value, (|x−a|a⋅100)% where a is the actual value

of the quantity and x is the approximate value of the quantity

An equation that states that two ratios are equivalent. It can be written in the form ab=cd , where

b and d are not zero

A figure formed by the intersection of a plane and a three-dimensional solid

means that grouping the factors in a three-factor multiplication expression in different ways does not change the product. For example, 7 × (6 × 10) = (7 × 6) ×

The distance between a number and zero on a number line. The absolute value of a number n is written |n|.

The constant unit rate in a proportional relationship between two quantities

states equivalence between two expressions, has an equal sign

Measures of two quantities are in a proportional relationship if there is a constant unit rate, known as the constant of proportionality k, between pairs of corresponding values, meaning the relationship is described by an equation of the form 𝑦 = 𝑘�

is a fraction with a denominator of 100

equals selling price minus cost price.

A quantity that describes a ratio relationship between two quantities

A ratio that compares the distances in a scale drawing to the distances in the original setting

An ordered pair of numbers that are not both zero

A copy of a figure in the plane with all distances proportional to the corresponding distances in

the original figure

The constant of proportionality in a scale drawing

When a rate is written so that the second of the two quantities is 1 unit, the unit rate is the numerical part of the rate