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1 variable a letter used to represent an unknown 2 variable expression a number sentence with variables and operation signs with no equal sign 3 evaluate solve 4 power base and exponent (shortened repeated multiplication) 5 base the number in a power being multiplied 6 exponent the number of times the base is being multiplied in a power 7 order of operations the rules used to solve all mathematical problems 8 equation a number sentence with an equal sign 9 solution answer 10 perimeter the distance around a closed figure 11 area the space inside a closed figure 12 sum answer to an addition problem 13 difference answer to a subtraction problem 14 product answer to a multiplication problem 15 quotient answer to a division problem ---------------------------------------------------------------------------------------------------------------------------16 decimal a way to represent part of a whole number 17 scientific notation a way to write very large or very small numbers, has a decimal part between 1 and 10 and is multiplied by a power of 10 18 metric system a decimal system of weights and measures (uses meter, liters, and grams) 19 meter metric unit of length, height of a doorknob 20 millimeter 1/1000 of a meter, thickness of a dime 21 centimeter 1/100 of a meter, width of a paperclip 22 kilometer 1000 meters, length of 9 football fields 23 gram metric unit of weight or mass, weight of a small paperclip 24 milligram 1/1000 of a gram, weight of a grain of sugar 25 kilogram 1000 grams, weight of a textbook 26 liter metric unit of capacity, large water bottle 27 milliliter 1/1000 of a liter, eyedropper 28 kiloliter 1000 liters, 8 trash cans of water 29 mean the sum of the values divided by the number of values 30 mode the value that occurs most often 31 range the difference between the greatest value and the least value 32 median the middle value when the values are written in numerical order 33 sample part of a group, used for a survey 34 population the entire group of people or objects that you want information about 35 random sample each person in the population has an equally likely chance of being selected 36 biased sample a non-random sample, not representative of the whole population 37 line plot- a number line with marks or dots that shows frequency 38 skew- what outliers do to a data set, throws off averages by adding a number much higher or much lower than the other data 39 repeating decimal- a decimal that has one or more numbers that repeats 40 terminating decimal- a decimal number that ends ___________________________________________________________________________________ 41 cluster data that is grouped together 42 gap a large hole in the data 43 lower quartile median of the lower half of a data set 44 lower extreme least value in a data set 45 upper quartile median of the upper half of a data set 46 upper extreme largest number in a data set 47 interquartile range the difference between the upper and the lower quartile in a box-and-whisker plot 48 histogram a graph to display intervals of one type of data 49 frequency table used to group data into intervals 50 intervals grouping of data broken into equal number span 51 frequency the number of values that show up in an interval 52. Integer positive and negative whole numbers and zero 53. Negative integer a whole number that is less than zero 54. Positive integer a whole number that is greater than zero 55. Absolute value a number’s distance away from zero on a number line 56. Opposite a number that is the same distance away from zero but on the other side of the number line 57. terms parts of an expression that are being combined for example in 3x+5 it would be the 3x and the 5 58. like terms terms that have the same variable part, an therefore can be combined 59. coefficient the number part of a term that also has a variable; the 4 in 4x 60. constant a term that has a number but no variable 61. inverse operation operations that undo each other 62. inequality a mathematical sentence formed by placing an inequality symbol between two expressions ___________________________________________________________________________________ 63. function a pairing of each number in a given set with exactly one number in another set 64. input number on which a function operates, (domain) 65. output number produced by evaluating a function given an input (range) 66. Coordinate plane a coordinate system used to graph numbers on, has an x and a y axis 67. x-axis horizontal line on a coordinate plane 68. y-axis vertical line on a coordinate plane 69. origin (0,0) on a coordinate plane, where the x and y axis meet 70. quadrant 4 corners of a coordinate plane 71. ordered pair pair of number used to identify a specific point on a coordinate plane 72. x coordinate first number in an ordered pair 73. y coordinate second number in an ordered pair 74. ratio comparison of two numbers using division: can be written as a fraction, with a colon: or a to b 75. rate a ratio of two quantities measured in different units 76. unit rate a rate that has a denominator of one unit 77. proportion an equation that states that two ratios are equal 78. scale a relationship between a drawing’s dimensions and the actual dimensions 79. outcomes the possible results when an experiment is performed 80. event a collection of outcomes of an experiment 81. favorable outcomes outcomes corresponding to a specific event 82. probability a number from zero to one that measures the likelihood that an event will occur 83. theoretical probability a probability based on all of the equally likely outcomes of an experiment 84. experimental probability a probability based on repeated trials of an experiment 85. set a collection of distinct objects 86. element an object in a set 87. empty set the set with no elements 88. universal set a set of all elements under consideration written as U 89. union the set of all elements in either set A or set B written as AU B 90. intersection (set) the set of all elements in both set A and set B , written as A∩ B