12 terms

Proportion

an equation stating that two ratios are equivalent

Conversions

a change in the form of a measurement, different units, without a change in the size or amount.

Tape Diagram

a drawing used to study number relationships, that looks like a segment of tape; also known as bar model

Equivalent Ratio or Rate

two ratios are equivalent if it is possible to multiply each of the quantities in the first ratio by the same positive number to equal the corresponding quantities in the second ratio; two ratios are equivalent if they share the same unit rate

Ratio

the relationship between a pair of numbers that does not change as its values are varied multiplicatively

Rate

a ratio relationship between two quantities

Unit Rate

a rate that tells how many units of one quantity correspond to 1 unit of a second quantity

Fraction

a number that represents part of a whole in the form a/b , where the denominator b does not equal zero

Ratio Table

a table of equivalent ratios between two related quantities

Double Number Line Diagram

Two number lines connected at zero used to compare two sets of numbers with different scales. They help students to visualize that there are infinitely many pairs of numbers with the same ratio.

Conversion Factor

the ratio of measurement in one set of units to the equivalent value in another set of units

Percent

a representation of a number as a rate per 100