Math Vocabulary
A
Acute - an angle less than 90°
Addend - one of the numbers being added in an addition problem
Addition - combining quantities
Algebra - a strand of mathematics in which variables are used to express rules about
numbers and relationships
Algorithm - a step-by-step procedure for math operations
Altitude - the height of a shape
And - 1) combine, 2) shared attributes, 3) represents decimal point when a number is
in words
Angle - two line segments that meet at a point
Apparent Outlier - a piece of data that is way out at the end of the range
Area - the size of a two-dimensional figure in square units
Array - a rectangular arrangement of objects with equal amounts in each row
Associative Property - the sum or product of a set of numbers is the same, no matter
how the numbers are grouped
Attribute - a characteristic of a shape or set of data
Average - a number that best describes a set of data
Axis - one of the reference lines on a coordinate graph
B
Balance - 1) a scale uses to figure out approximate weight, or 2) to be equal or to
make equal
Bar Graph - a way of organizing data in horizontal or vertical bars
Base - the face on which a three-dimensional object sits
Beneath - in a lower place
Between - in a position that separates two other things
Bi - prefix meaning two
Binary - a number system which used only the digits of 0 and 1
Bisect - to divide into two equal parts
Bisymmetrical - a line that divides a two-dimensional shape in two congruent parts
that are mirror images of each other
Borrowing - see subtraction
C
Calculate - to perform a mathematical operation (+, -, x, divide sign)
Calendar - a tool to keep track of the date
Capacity - how much an object can hold
Cartesian plane - coordinate grid
Center - middle point
Centimeter - a metric measure which takes 10 millimeters to make
Century - 100 years
Chord - a line segment which joins two points on a circle
Circle - a perfectly round shape that has all points equally as far from the center
Circumference - the perimeter of a circle
Coins - metal money
Clockwise - turning in the direction a clock turns - to the right
Column - a vertical list
Commutative Property - the sum or product stays the same when the order of
addends/factors changes
Composite Number - a number that has more than two factors
Compute - to figure out an answer
Cone - a three-dimensional shape with a circle base and one vertex
Congruent - having exactly the same shape and size
Consecutive - in order
Connect - to join together
Coordinates - an ordered pair of numbers that gives the location of a point on a coordinate
grid
Corner -
Count - to say numbers one by one in order
Counterclockwise - turning in the opposite direction a clock turns - to the left
Cube - a three-dimensional shape with six square faces
Curve - a line that is not straight, but does not have a corner (vertex)
Cylinder - a three-dimensional shape with parallel circular bases
D
Data - information
Decagon - ten-sided polygon
Decimal - a fractional number less than one whole written with a decimal point
Decimeter - one-tenth of a meter, equal to 10 centimeters
Denominator - the bottom number in a fraction which tells the number of pieces making
up a whole
Diagonal - a line segment that connects one vertex to another on a polygon, but is not
on the perimeter of the polygon
Diameter - a line segment that goes through the center of a circle
Difference - the amount that remains when one quantity is subtracted from another
Digit - any one of the symbols used in making numbers (0, 1, 2, 3, 4, 5, 6, 7, 8, 9)
Digital Root - adding digits in a number until only one digit remains
Dimension - the number of measures needed to describe a geometric figure
Distance - a measure of length giving how far things are apart
Distributive Property - when one factor is written as a sum, multiplying each addend
before adding produces the same product
Division - the operation which makes equal groups
Divisor - the amount by which another quantity is to be divided
Dodecagon - twelve-sided polygon
Double - twice as much
E
Each - every one of a group
Edge - a line that connects two faces on a three-dimensional shape
Endpoint - the end of a line segment
Equal - having the same value as
Equilateral Triangle - a triangle with all sides having the same length
Equation - a math sentence showing two parts as equal
Equivalent - having the same value
Estimate - an approximate answer
Even - a number that is a multiple of 2. It has a 0, 1, 2, 4, 6, or 8 in the one’s place
Expanded Form - a number that is stretched out to show all the place value parts
Exponent - a number that shows how many times a number is to be multiplied by
Itself
F
Face - a side on a three-dimensional shape
Face Value - the amount something is worth as shown
Fact - something proven to be true
Fact Families - a group of addition/subtraction or multiplication/division facts that use
the same set of numbers in various combinations
Factor - a number that is multiplied by another number
Fewer - less than
Flip - reflection rotation
Foot - 12 inches in standard measurement
Formula - an equation or rule that shows a relationship between two or more numbers
Fraction - a number showing part of a whole
Frequency - how often something happens in a set of data or within a certain time
Function - gives one output value for each input value
G
Gallon - a standard measure of liquid equal to 128 ounces or 4 quarts
Geometry - a strand of mathematics dealing with figures and their parts
Googal - a number which has a 1 followed by 100 zeros
Gram - a metric measure of weight/mass smaller in weight than an ounce
Graph - a visual display of data
Greater Than - more than
Grid - a set of horizontal and vertical lines which form squares
Growth Pattern - a type of pattern made by following a certain rule (formula)
H
Half - one of two equal parts
Height - the distance from the base to the top of something
Hemi - half
Hemisphere - half of the earth
Heptagon - seven-sided polygon
Hexagon - six-sided polygon
Horizontal - a line parallel to the horizon
Hour - a measure of time equaling 60 minutes
Hypotenuse - the longest side of a right triangle which is opposite the right angle
I
Imperial Measure - standard form of measurement including inches, pounds, etc.
Improper Fraction - a fraction greater than one whole that is not written as a mixed
number
Inch - a standard measure of length, one-twelfth of a foot
Infinity - never ending
Integer - whole numbers and their negative partners (1 and -1)
Intersection - the elements that belong to both sets in overlapping sets
Isosceles Triangle - a triangle with two sides that are the same length
J
Junction - any place where two or more things join to meet
K
Kilo - one thousand
Kilogram - a metric measure of weight/mass equal to 1,000 grams (just over 2
pounds)
Kilometer - a metric measure of length equal to 1,000 meters (over 3200 feet)
L
Lateral - side part
Latitude - the distance north and south of the equator
Least - smallest
Length - the distance along a line or figure from one point to another
Less Than - fewer than
Light Year - the distance light travels through space in one year (about 5.8 trillion
miles)
Line - a straight path that extends forever in both directions
Line of Symmetry - a line that divides a shape into two halves that are a mirror
image of each other
Line Segment - a straight path from one point to another
Linear - having to do with lines
Liter - a metric measure of volume/capacity almost equal to a quart
Longitude - the distance east and west of the equator
M
Mass - how much matter is in an object
Maximum - greatest amount
Mean - a way to average a group without extremes in the data in which all data is
added and equally divided up
Measure - the length, quantity, dimensions, or capacity of something
Median - a way to average counts or measures when they are extremes in the data.
The middle point of the ordered group of data is found
Metric - a system of measurement based on tens
Midpoint - the point on a line segment that divides the segment into two equal parts
Mile - a standard measure of length equal to 5280 feet
Million - a large number equal to one thousand 1,000s
Minimum - least amount
Minute - a measure of time equal to 60 seconds
Mixed Fraction - a number with a whole number and a fraction part
Mode - a way to average data when there are many identical data points. The mode is
the data that occurs most often
Money - coins and paper bills used for buying and selling
More Than - greater than
Multiple - the product of any two whole numbers
Multiplication - the operation of adding the same number over and over or groups
shown in an array
N
Negative Numbers - numbers less than zero
Net - a two-dimensional figure that can be folded to make a three-dimensional model
Network - connection between points or line segments
Nonagon - nine-sided polygon
None - not even one
Number - symbols used for counting and measuring
Numberline - a picture (diagram) showing numbers as points on a line
Numeral - digits used to make up numbers
Numerator - the top number in a fraction which tells the number of parts selected
O
Oblong - a shape that is greater in length than in width
Obtuse Angle - an angle greater than 90°
Octagon - eight-sided polygon
Odd - a number that is not a multiple of 2. It has a 1, 3,5, 7, or 9 in the one’s place
Ounce - a standard measure of weight/mass
Outcome - one of the possibilities in a probability experiment
Oval - a curved shape like an egg
P
Parallel - straight lines that always stay the same distance away from each other
Parallelogram - a four-sided polygon with two sets of parallel sides
Patterns - a repeating sequence of number or shapes
Pentagon - five-sided polygon
Percent - a number compared to part of 100 using a % sign
Perimeter - distance around the outside edge of a closed figure
Perpendicular- two lines that form a right angle where they intersect
Pictograph - a visual display of data which uses pictures to represent amounts
Pi - the comparison of the diameter of a circle to its circumference (about 3.14)
Pint - standard unit of liquid measure equaling two cups
Place Value - the value of each digit in a number
Point - a location (dot) that has no length, width or height
Polygon - a closed two-dimensional figure made with straight line segments which join
only at endpoints
Position - the place something holds in space
Possible - has a chance of happening
Prime Number - a number with only two factors: 1 and itself
Prism - a three-dimensional shape with two congruent bases
Probability - the strand of math looking at the chance of events occurring
Product - the answer to a multiplication problem
Proportion - a number sentence showing two equal ratios
Protractor - a math tool for measuring and drawing angles
Pyramid - a three-dimensional figure with a polygon base and all other faces are triangles
which met at a common vertex
Q
Quadrant - one of the four sections of a coordinate grid
Quadrilateral - four-sided polygon
Qualify - to describe the characteristics of something
Quantity - an amount
Quart - a standard unit of liquid measure that is equal to 4 cups
Quarter - 1) a coin with a value of $.25, 2) one-fourth of something
Quotient - the answer to a division problem
R
Radius - a line segment from the center of a circle to the edge
Random - by chance
Range - the least to greatest value in a set of data
Ratio - comparing two numbers using division
Rectangle - a parallelogram with four right angles
Reflection - creating a mirror image of a shape by flipping it over
Remainder - the amount left over when you have divided as far as possible. Must be
smaller than the divisor
Reoccurring - happening repeatedly
Rhombus - a parallelogram with all sides equal in length
Right Angle - a 90° angle
Rotation - turning a shape around on a vertex
Rounding - determining an approximate value of a number to a given place value
Row - a horizontal list
Rule - words that describe a relationship between numbers or objects
Ruler - a measuring tool used to determine length
S
Second - 1) number two in order, or 2) a measure of time equal to 1/60th of a minute
Scale - a measuring tool used to determine weight
Scalene - a triangle with three sides, each a different length
Semicircle - half of a circle
Septagon - seven-sided polygon
Set - a collection of data with something in common
Shape - something having a specific form
Side - a line segment that forms part of a polygon
Simplify - to reduce a fraction to lowest terms
Similar - having the same shape, but not the same size
Slope - the rise of a line
Solid figure - a geometric shape with three dimensions
Sort - to put together things that are in some way alike
Sphere - a perfectly round three-dimensional geometric solid
Square - a parallelogram with four congruent sides and four right angles
Square Number - numbers that can be shown in a square array
Straight - unbending
Subtraction - the operation of finding the difference between two numbers or taking
away
Sum - the answer in an addition problem
Surface - the outside part
Surface area - the area of all the faces on a three-dimensional shape
Symbol - something that stands for something else
Symmetry - showing an exact duplicate of a shape on an opposite side of a line (line
of symmetry) or around a central point (point symmetry)
T
Table - an orderly arrangement of data
Take Away - see subtraction
Tally - marks used to keep track of an amount
Temperature - amount of heat or cold, measured by a thermometer
Tesselate - to arrange an area in a repeating geometric pattern
Tetrahedron - a three-dimensional shape with four triangular faces
Tile - see tesselate
Time - the way we measure years, days, minutes
Total - the whole amount
Translation - sliding a geometric shape a certain distance in the same direction
Trapezoid - a quadrilateral with only one set of parallel sides
Triangle - a three-sided polygon
Triangular Numbers - a sequence of numbers that can be shown with dots making up
a triangle shape
U
Undecagon - an 11-sided polygon
Uneven - not even
Uniform - the same
Unit - a fixed amount in measurement
V
Value - how much something is worth
Variable - a letter or symbol that stands for another number
Venn Diagram - a drawing with circles that shows relationships between sets of data
Vertex - the place where two or more line segments come together
Vertical - a line that is perpendicular to the horizon
Volume - the number of cubic units it takes to fill a three-dimensional shape
W
Week - a set of seven consecutive days
Weight - a measure of the heaviness of an object
Whole Number - all counting numbers including zero
Width - a measure of the distance of an object from side to side
X
x-axis - the horizontal axis on a coordinate grid
Y
Yard - a standard unit of measure equal to 3 feet
y-axis - the vertical axis on a coordinate grid
Year - a length of time equal to 365 days
Z
Zenith - the highest or greatest point
Zero - a number with no value
Zillion - a large number equal to a thousand millions