ratio

a comparison of two numbers or quantities by division

word (a to b) fraction (a over b) ratio (a:b)

three forms of a ratio

terms

the numbers in a ratio

equivalent ratios

have the same value, usually written as fractions

rate

a ratio that compares quantities with two different units of measure

unit rate

rate that has one unit as one of its terms

proportion

an equation that shows two ratios are equivalent (=)

solving proportions

use cross-products rule to solve for a missing term in a proportion.

writing proportions

ratios in proportions compare similar quantities