Math Vocabulary, Set 1-21

Front 1

Bar Graph

Back 1

A graph that uses bars to display data

Front 2

Acute Angle

Back 2

An angle that measures less than 90º and greater than 0º

Front 3

Axes (of a graph)

Back 3

The horizontal and vertical number lines used in a rectangular graph or coordinate grid system.

Front 4

Acute Triangle

Back 4

A triangle in which each angle is acute

Front 5

Algebraic Rule

Back 5

A mathematical expression that contains variables and describes a pattern or relationship

Front 6

Base

Back 6

The line or plane upon which a figure is thought to rest

Front 7

Angle

Back 7

The shape made by two rays extending from a common end point, the vertex

Front 8

Area

Back 8

The inside region of a two dimensional figure measured in square units

Front 9

Capacity

Back 9

The amount of space that can be filled. Often refers to measurement of a liquid

Front 10

Closed Figure

Back 10

A two dimensional figure whose beginning and ending points meet.

Front 11

Equation

Back 11

A mathematical sentence (ie, 2x=10) that equates one expression to another expression (10)

Front 12

Composite Number

Back 12

A whole number that has more than two factors

Front 13

Congruent

Back 13

A term describing figures or objects that are the same size and shape

Front 14

Coordinate Grid or System

Back 14

A network of evenly spaced, parallel,horizontal & vertical lines especially designed for locating points,displaying data or drawing maps

Front 15

Equilateral Triangle

Back 15

A triangle with congruent sides and all congruent angles

Front 16

Customary Units

Back 16

The units of measure developed and used in the united states

Front 17

Decimal Number

Back 17

Any number written with a decimal point in the number. A decimal number falls between two whole numbers.

Front 18

Equivalent forms of a number

Back 18

The same number expressed in different forms (ie, 3/4, 0.75, 75%)

Front 19

Denominator

Back 19

The number written below the fraction bar that tells the number of parts a whole is divided into

Front 20

Divisor

Back 20

The number by which another number (the dividend) is divided

Front 21

Estimation

Back 21

The use of rounding and/or other strategies to determine a reasonable accurate approximation, without calculating an exact answer

Front 22

Divisible

Back 22

A term describing a number capable of being divided into equal parts without a remainder

Front 23

Expanded Form

Back 23

A way to write a number showing the place value of each digit

Front 24

Effects of operation

Back 24

The results of applying an operation to given numbers (ie, adding two whole numbers results in a number greater than or equal to the original number)

Front 25

Empirical Probablity

Back 25

The likelihood of an event happening that is based on experience

Front 26

Expression

Back 26

A collection of numbers, symbols,and/or operation signs that stands for a number

Front 27

Function

Back 27

The relationship between two sets (numbers for example) in which each element of one set has one assigned element in another set. See pattern.

Front 28

Factor

Back 28

A number or expression that divides exactly another number (ie, 1,2,4,5,10,and 20 are factors of 20)

Front 29

Grid

Back 29

A network of evenly spaced, parallel, horizontal and vertical lines.

Front 30

Face

Back 30

One of the plane surfaces bounding a three dimensional figure ( a side)

Front 31

Height

Back 31

A line segment extending from the vertex or apex of a figure to its base.

Front 32

Flip

Back 32

A transformation that produces the mirror image of a geometric figure. Also called a reflection.

Front 33

Improper Fraction

Back 33

A fraction in which the numerator is greater than or equal to its denominator

Front 34

Inequality

Back 34

A sentence that states one expression is greater than, greater than or equal to, less than, less than or equal too, or not equal to another expression

Front 35

Fraction

Back 35

Any part of a whole.

Front 36

Integers

Back 36

The set of whole numbers,their negative opposites, and zero

Front 37

Intersection

Back 37

the point at which two lines meet

Front 38

isosceles triangle

Back 38

a triangle with two congruent sides and two congruent angles

Front 39

labels (for a graph)

Back 39

the titles given to a graph, the axes of a graph,or to the scales on the axes of a graph

Front 40

length

Back 40

a one dimensional measure that is the measurable property of line segments

Front 41

Likelihood

Back 41

the chance that something is going to happen

Front 42

Line

Back 42

A Straight line that is endless in length

Front 43

Line Graph

Back 43

A graph that displays data using connected line segments (usually represents data over time)

Front 44

Mean

Back 44

The average of a set of numbers found by adding the numbers in a set and dividing by the number of addends

Front 45

Median

Back 45

the middle number of a set of numbers when the numbers are arranged from least to greatest, or the mean of the two middle numbers when the set has two middle numbers.

Front 46

Metric Units

Back 46

The units of measure developed in Europe and used inmost of the world

Front 47

Mixed Numbers

Back 47

a number that contains a whole number and a fraction

Front 48

Mode

Back 48

The number that appears most frequently in a set of numbers. There may be one, more than one, or no mode.

Front 49

Multiples

Back 49

The numbers that result from multiplying a given number by the set of whole numbers

Front 50

Nonstandard Units of Measure

Back 50

Objects such a blocks, paper clips, crayons, or pencils that can be used to obtain a measure.

Front 51

Number line

Back 51

a line on which numbers can be written or visualized

Front 52

Numerator

Back 52

the number above the fraction bar that tells how many equal parts are chosen

Front 53

Obtuse angle

Back 53

An angle with a measure of more than 90º but less than 180º

Front 54

Obtuse triangle

Back 54

A triangle that has an obtuse angle

Front 55

Operation

Back 55

Any mathematical process, such as addition,subtraction,multiplication,
division,raising to a power or finding the square root

Front 56

Ordered Pair

Back 56

A pair of numbers that gives the coordinates of a point on a grid

Front 57

Order of Operations

Back 57

The rules that tell the order in which operations should be done

Front 58

Organized data

Back 58

Data arranged in a display that is meaningful and assists in the interpretation of the data

Front 59

Parallel Lines

Back 59

two lines in the same plane that never meet

Front 60

Parallelogram

Back 60

a quadrilateral with opposited sides that are parallel and congruent.

Front 61

Pattern

Back 61

a predictable or prescribed sequence of numbers, objects, etc.

Front 62

Percent

Back 62

a special ration that compares a number to 100 using the symbol %.

Front 63

Perimeter

Back 63

the distance around a figure.

Front 64

Place Value

Back 64

the value of a digit according to its position in a number

Front 65

Plane

Back 65

a flat two dimensional surface or figure that extends infinitely in all directions.

Front 66

point

Back 66

a location in space that has no length or width.

Front 67

polygon

Back 67

a closed plane figure whose sides are straight lines that are connected end-point to end-point.

Front 68

Prime

Back 68

number any whole number with only two factors, 1 and itself.

Front 69

Probability

Back 69

a measure of the likelihood that given event will occur, expressed as a number between 0 and 1.

Front 70

Product

Back 70

the result when numbers are multiplied together.

Front 71

Quotient

Back 71

the answer in a division problem.

Front 72

Range

Back 72

the difference between the greatest number and the least number in a set of numbers.

Front 73

Ratio

Back 73

a comparison of two numbers with division.

Front 74

Ray

Back 74

a part of a line that has one endpoint and extends indefinitely in one direction.

Front 75

Reflection

Back 75

a transformation that produces the mirror image of a geometric figure. Also called a flip.

Front 76

Regular polygon

Back 76

a polygon that is both equilateral and equiangular.

Front 77

Remainder

Back 77

the number less than the divisor that is left over after a division problem is complete.

Front 78

Right angle

Back 78

an angle whose measure is exactly 90°.

Front 79

Right triangle

Back 79

a triangle that has a right angle.

Front 80

Rotation

Back 80

a transformation of a figure by turning it about a center point or axis. Also called turn.

Front 81

Rounding

Back 81

to change a number to the nearest ten, hundred, and so on in order to make it easier to use.

Front 82

Rule

Back 82

a mathematical expression that describes a pattern or relationship, or a written description of the pattern or
relationship.

Front 83

Scale model

Back 83

a model or drawing based on a ration of the dimensions for the model and the actual object it represents.

Front 84

Scale

Back 84

the numeric values assigned to the axes of a graph.

Front 85

Scalene triangle

Back 85

a triangle with no congruent sides or angles.

Front 86

Side

Back 86

the edge of a geometric figure.

Front 87

Similar figure

Back 87

figures that are the same shape, having corresponding, congruent angles, and have corresponding sides that are
proportional in length.

Front 88

Simpliest form

Back 88

a fraction in which the numerator and denominator have no common factors except 1.

Front 89

Slide

Back 89

to move along in constant contact with the surface in a vertical, horizontal, or diagonal direction. Also called
translation.

Front 90

Spatial

Back 90

relationships relationships of figures existing or happening in space.

Front 91

Straight angle

Back 91

an angle whose measure is exactly 180°.

Front 92

Standard form

Back 92

a way to write a number by using the digits 0-9.

Front 93

Sum

Back 93

the total when numbers are added together

Front 94

Symmetry

Back 94

a term describing the result of a line drawn through the center of a figure such that the two halves are
congruent.

Front 95

Theoretical/expected probability

Back 95

the likelihood of an event happening based on theory rather than inexperience and observation.

Front 96

Transformation

Back 96

an operation on a geometric figure by which another image is created. Common transformations include flips,
slides and turns.

Front 97

Translation

Back 97

to move along in constant contact with the surface in a vertical, horizontal, or diagonal direction. Also called slide.

Front 98

Trapezoid

Back 98

a quadrilateral with only 2 parallel sides

Front 99

Tree diagram

Back 99

a diagram in which all the possible outcomes of a given event are displayed.

Front 100

Turn

Back 100

a transformation of a figure by turning it about a center point or axis. Also called rotation.

Front 101

Variable

Back 101

any symbol that could represent a number

Front 102

Vertex

Back 102

the point at which two line segments, lines or rays meet to form an angle.

Front 103

Volume

Back 103

the amount of space occupied in three dimensions and expressed in cubic units.

Front 104

Word form

Back 104

a number written in words.