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### 36 Cards in this Set

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 rational number The set of numbers expressed in the form of a fraction, a over b, where a and b are integers and b is not equal to 0. natural numbers The set [1,2,3,...] counting numbers whole numbers The set [0,1,2,3,...] intergers The set [...-2,-1,0,1,2,...] graph To draw, or plot, the points named by certain numbers or ordered pairs on a number line or coordinate plane. coordinate th number that corresponds to a point on a number line. àbsolute value The absolute value of a number n is the distance from zero on a number line and is represented by |n|. positive numbers negative numbers + are to the R of 0 - values less than 0, listed to the left of 0 opposites Every positive rational number and its negative pair. additive inverses A number and its opposite are additive inverses of each other. The sum of a number and its additive inverse is 0. division of integers The quotient of two numbers having the same sign is positive, having different signs is negative. line plot A number line labled with a scale to include all the data with an X placed above a data point each time it occurs. measures of central tendency Numbers or pieces of data that can represent the whole set of data. The three basic measures of central tendency are: Mean, Median and Mode. mean The sum of the numbers in a set of data divided by the number of items. mode The middle number or numbers that appear most often in a set of data.If no item appears the most often, the set has no mode. median The middle number of a set of data when the data are arranged in numerical order. If there are an even number of data, the median is the mean of the two middle numbers. line plot A number line labled with a scale to include all the data with an X placed above a data point each time it occurs. frequency How often a piece of data occurs. stem-and-leaf plot A system used to seperate data into two numbers that are used to form a stem-and-leaf. back-to-back-stem-and-leaf plot Used to compare two related sets of data. probability The ratio of the number of favorable outcomes for an event to the number of possible outcomes of the event. P(a) = Number of favorable outcomes / total number of possible outcomes simple event A single event. sample space The list of all possible outcomes. equally likely Outcomes for which the probillity of each occuring is equal. odds The ratio that compares the number of ways an event can occur (successes) to the number of ways the event cannot occur (failures) square root One of two equal factors of a number. perfect square A number whose square root is a rational number. principal square root The nonnegative square root of a number. irrational numbers Numbers that cannot be expressed as terminating or repeating decimals. real numbers The set of rational numbers and the set of irrational numbers together. completeness property Each point on the number line corresponds to exactly one real number. rational approximation A rational number that is close to, but not equal to, the value of an irrational number. multiplicative property of -1 The product of any number and -1 is its additive inverse. dividing integers The quotient of two numbers having the same sign is positive, having different signs is negative. multiplying integers Product of two numbers with same sign is positive, different signs is negative. *even number of negative integers, product is positive, odd number of negative integers, product is negative. radical sign, The radical sign is used to indicate a nonnegative square root. .