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x/100

x% =

(x/100) * y

x% of y =

percent =

(part/whole) * 100%

% change =

(actual change/original amount) * 100%

x:y or (x/y)

the "ratio of x to y" can also be written as

ratio

A comparison of two quantities, also know as fancy word for fraction.

number of items represented by the other part as well as the total number of items

if you are given a ratio and the number of items that corresponds to one part of the ratio, you can find the

the total number of items

with only the ratio you cannot find

with only the ratio you can find

what the total number of items is a multiple of

to combine ratios

give them a common term

(a/b) + (c/d)

(ad + bc) / bd

proportion

An equation that states that two ratios are equal.

average formula

(sum of terms) / (# of terms)

Median

A segment or Ray that joins a vertex to the midpoint of the opposite side

Mode

the most common value

in a set of evenly spaced numbers

the median and the average are the same

direct variation

A situation when one value increases as the other vaule increases or as one decreases the other decreases. y = kx k≠0

Inverse Variation

A situation when one value increases and the other value decreases. y = k/x k≠0

y = kx

direct variation equation

y = (k/x)

inverse variation equation

percent increase/decrease formula

[(amount of increase or decrease)/(original amount)] * 100%